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Time in the Animal World
Rhythm controls everything in Nature._______(46)The sun provides a basic time rhythm for all living creatures including humans.Nearly all animals are influenced by sun cycles and have developed a biological clock in their bodies following these cycles.The moon also exerts its force and influence on the sea. Its gravitational attraction causes the rising of the tide._______(47)When the moon is behind the Earth,centrifugal force causes the second tide of the day.
Animals living in tidal areas must have the instinct of predicting these changes,to avoid being stranded and dying of dehydration.Since the time of the dinosaurs,the king crab has been laying eggs at the seaside in a set way.To avoid predator fish,the eggs are always far from seawater and protected by sand.In the following two months,the eggs undergo dramatic changes related to the cycles of the moon.When the second spring tide comes,the young king crabs have matured._______(48)
Most of the mammals,either the giant elephant or the small shrew,have the same average total number of heartbeats in their lifetime.Shrews live only for two and a half years,and spend their life at a high speed and high tempo.Animals like shrews with a pulse rate of 600 per minute have an average total of eight hundred million heartbeats throughout their life.The African elephant has a pulse rate of 25 beats per minute,and a life span of 60 years.The size of the body determines the speed of life._______(49)
As we get older,our sense of time is being influenced by the physiological changes of our body.The elderly spend more time resting,and do few sports._______(50)For a child,a week is seen as a long time.
Time in the Animal World
Rhythm controls everything in Nature._______(46)The sun provides a basic time rhythm for all living creatures including humans.Nearly all animals are influenced by sun cycles and have developed a biological clock in their bodies following these cycles.The moon also exerts its force and influence on the sea. Its gravitational attraction causes the rising of the tide._______(47)When the moon is behind the Earth,centrifugal force causes the second tide of the day.
Animals living in tidal areas must have the instinct of predicting these changes,to avoid being stranded and dying of dehydration.Since the time of the dinosaurs,the king crab has been laying eggs at the seaside in a set way.To avoid predator fish,the eggs are always far from seawater and protected by sand.In the following two months,the eggs undergo dramatic changes related to the cycles of the moon.When the second spring tide comes,the young king crabs have matured._______(48)
Most of the mammals,either the giant elephant or the small shrew,have the same average total number of heartbeats in their lifetime.Shrews live only for two and a half years,and spend their life at a high speed and high tempo.Animals like shrews with a pulse rate of 600 per minute have an average total of eight hundred million heartbeats throughout their life.The African elephant has a pulse rate of 25 beats per minute,and a life span of 60 years.The size of the body determines the speed of life._______(49)
As we get older,our sense of time is being influenced by the physiological changes of our body.The elderly spend more time resting,and do few sports._______(50)For a child,a week is seen as a long time.
_________（47）
A:For an adult,time goes fast year by year.
B:It controls,for example,the flapping of birds' wings,the beating of the heart and the rising and setting of the sun.
C:The larger the animal is,the longer its life span is and the slower its life tempo is.
D:The tide goes out when the moon moves away and its attraction is weaker.
E:We always tend to think all the animals have the same sense of time as human beings.
F:The second spring tide takes them back to the sea.
A:For an adult,time goes fast year by year.
B:It controls,for example,the flapping of birds' wings,the beating of the heart and the rising and setting of the sun.
C:The larger the animal is,the longer its life span is and the slower its life tempo is.
D:The tide goes out when the moon moves away and its attraction is weaker.
E:We always tend to think all the animals have the same sense of time as human beings.
F:The second spring tide takes them back to the sea.
参考答案
参考解析
解析：本空前文提到：节奏控制着自然界中的一切事物，是主题句。空中所填内容应该是陈述主题句的细节。选项B" It controls, for example, the flapping of birds' wings, the beating of the heart and the rising and setting of the sun.”例如，它控制着鸟类翅膀拍击、心跳和日出与日落，这句是用来说明主题句的例子。controls是两个句子的词汇连接手段，两个句子的内容也连贯。所以B是答案。
本空前文提到：月亮对大海施加力量和影响，其地心吸力造成涨潮。空后的句子涉及第二次涨潮。可以推断，位于这两个句子之间的所要填的内容应该与大海和潮汐有关。选项D说的是退潮。所以选项D是正确答案。
本空前文提到：生长在潮汐地区的动物具有预测潮汐的本能。然后以国王螃蟹为例。螃蟹远离海岸产卵，并将之埋在沙下，防止食肉鱼吞食。到第二次春潮来临时，小螃蟹已破壳而出。选项F第二次春潮会把他它们带回大海，其中出现second spring，这是与上一句联系的信号。从内容上看，它是上一句意思的自然发展。所以选项F是正确答案。
本空前文提到：哺乳动物不管寿命长短、体形大小，其一生心跳总次数大致相同。作者举体形大、寿命长的大象和体形小、寿命短的尖鼠为例说明。本段的倒数第二句是结论：The size of the body determines the speed of life．体型的大小决定生命的速度。由此可以推理出本空所填内容应该与上述结论有关。选项C动物的体型越大，它们的寿命就越长，生命节奏也就越慢，这一内容是对上一句的结论的细化说明。所以选项C是正确答案。
第四段说到随着年龄的增长，生理变化会影响人的时间感。本空前面一句说到老人，后面一句说到小孩。由此可以判断，本空的内容会涉及另一个年龄段。选项A 对成年人来说，时间一年一年地过得很快，其中提到了成年段。所以选项A是正确答案。
本空前文提到：月亮对大海施加力量和影响，其地心吸力造成涨潮。空后的句子涉及第二次涨潮。可以推断，位于这两个句子之间的所要填的内容应该与大海和潮汐有关。选项D说的是退潮。所以选项D是正确答案。
本空前文提到：生长在潮汐地区的动物具有预测潮汐的本能。然后以国王螃蟹为例。螃蟹远离海岸产卵，并将之埋在沙下，防止食肉鱼吞食。到第二次春潮来临时，小螃蟹已破壳而出。选项F第二次春潮会把他它们带回大海，其中出现second spring，这是与上一句联系的信号。从内容上看，它是上一句意思的自然发展。所以选项F是正确答案。
本空前文提到：哺乳动物不管寿命长短、体形大小，其一生心跳总次数大致相同。作者举体形大、寿命长的大象和体形小、寿命短的尖鼠为例说明。本段的倒数第二句是结论：The size of the body determines the speed of life．体型的大小决定生命的速度。由此可以推理出本空所填内容应该与上述结论有关。选项C动物的体型越大，它们的寿命就越长，生命节奏也就越慢，这一内容是对上一句的结论的细化说明。所以选项C是正确答案。
第四段说到随着年龄的增长，生理变化会影响人的时间感。本空前面一句说到老人，后面一句说到小孩。由此可以判断，本空的内容会涉及另一个年龄段。选项A 对成年人来说，时间一年一年地过得很快，其中提到了成年段。所以选项A是正确答案。
更多 “共用题干 Time in the Animal WorldRhythm controls everything in Nature._______(46)The sun provides a basic time rhythm for all living creatures including humans.Nearly all animals are influenced by sun cycles and have developed a biological clock in their bodies following these cycles.The moon also exerts its force and influence on the sea. Its gravitational attraction causes the rising of the tide._______(47)When the moon is behind the Earth,centrifugal force causes the second tide of the day.Animals living in tidal areas must have the instinct of predicting these changes,to avoid being stranded and dying of dehydration.Since the time of the dinosaurs,the king crab has been laying eggs at the seaside in a set way.To avoid predator fish,the eggs are always far from seawater and protected by sand.In the following two months,the eggs undergo dramatic changes related to the cycles of the moon.When the second spring tide comes,the young king crabs have matured._______(48)Most of the mammals,either the giant elephant or the small shrew,have the same average total number of heartbeats in their lifetime.Shrews live only for two and a half years,and spend their life at a high speed and high tempo.Animals like shrews with a pulse rate of 600 per minute have an average total of eight hundred million heartbeats throughout their life.The African elephant has a pulse rate of 25 beats per minute,and a life span of 60 years.The size of the body determines the speed of life._______(49)As we get older,our sense of time is being influenced by the physiological changes of our body.The elderly spend more time resting,and do few sports._______(50)For a child,a week is seen as a long time._________（47）A:For an adult,time goes fast year by year.B:It controls,for example,the flapping of birds' wings,the beating of the heart and the rising and setting of the sun.C:The larger the animal is,the longer its life span is and the slower its life tempo is.D:The tide goes out when the moon moves away and its attraction is weaker.E:We always tend to think all the animals have the same sense of time as human beings.F:The second spring tide takes them back to the sea.” 相关考题
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Passage 1
Plants and animals that have been studied carefully seem to have built-in clocks. These biological clocks, as they are called, usually are not quite exact in measuring time. However, they work pretty well because they are "reset" each day, when the sun comes up.
Do pigeons use their biological clocks to help them find directions from the sun? We can keep pigeons in a room lit only by lamps. And we can program the lighting to produce artificial "days",different from the day outside. After a while we have shifted their clocks. Now we take them far away from home and let them go on a sunny day. Most of thegn start out as if they know just which way to go, but choose a wrong direction. They have picked a direction that would be correct for the position of the sun and the time of day according to their shifted clocks.
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What can be inferred from the passage about biological clocks?
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A．They are used by all plants and animals to tell time.
B．Pigeons' biological clocks are regulated every day with the sunrise.
C．The built-in biological clocks cannot be changed.
D．They gradually developed as pigeons grow mature.
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1.Certainly no creature in the sea is odder than the common sea cucumber. All living creatures,especially human beings,have their peculiarities,but everything about the little sea cucumber seems unusual.What else can be said about a bizarre animal that,among other eccentricities, eats mud,feeds almost continuously day and night but can live without eating for long periods,and can be poisonous but is considered supremely edible by gourmets?2.For some fifty million years,despite all its eccentricities,the sea cucumber has subsisted on its diet of mud.It is adaptable enough to live attached to rocks by its tube feet,under rocks in shallow water,or on the surface of mud flats.Common in cool water on both Atlantic and Pacific shores, it has the ability to suck up mud or sand and digest whatever nutrients are present.3.Sea cucumbers come in a variety of colors,ranging from black to reddish brown to sand color and nearly white.One form even has vivid purple tentacles.Usually the creatures are cucumber shaped一hence their name一and because they are typically rock inhabitants,this shape,combined with flexibility,enables them to squeeze into crevices where they are safe from predators and ocean currents.4.Although they have voracious appetites,eating day and night,sea cucumbers have the capacity to become quiescent and live at a low metabolic rate feeding sparingly or not at all for long periods,so that the marine organisms that provide their food have a chance to multiply.If it were not for this faculty,they would devour all the food available in a short time and would probably starve themselves out of existence.5.But the most spectacular thing about the sea cucumber is the way it defends itself. Its major enemies are fish and crabs,when attacked,it squirts all its internal organs into water. It also casts off attached structures such as tentacles.The sea cucumber will eviscerate and regenerate itself if it is attacked or even touched;it will do the same if the surrounding water temperature is too high or if the water becomes too polluted.According to the passage,of all the sea creatures,sea cucumbers are the most______.A:extinctB:bizarreC:interestingD:inactive E:greedyF: reproduce
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共用题干
1.Certainly no creature in the sea is odder than the common sea cucumber. All living creatures,especially human beings,have their peculiarities,but everything about the little sea cucumber seems unusual.What else can be said about a bizarre animal that,among other eccentricities, eats mud,feeds almost continuously day and night but can live without eating for long periods,and can be poisonous but is considered supremely edible by gourmets?2.For some fifty million years,despite all its eccentricities,the sea cucumber has subsisted on its diet of mud.It is adaptable enough to live attached to rocks by its tube feet,under rocks in shallow water,or on the surface of mud flats.Common in cool water on both Atlantic and Pacific shores, it has the ability to suck up mud or sand and digest whatever nutrients are present.3.Sea cucumbers come in a variety of colors,ranging from black to reddish brown to sand color and nearly white.One form even has vivid purple tentacles.Usually the creatures are cucumber shaped一hence their name一and because they are typically rock inhabitants,this shape,combined with flexibility,enables them to squeeze into crevices where they are safe from predators and ocean currents.4.Although they have voracious appetites,eating day and night,sea cucumbers have the capacity to become quiescent and live at a low metabolic rate feeding sparingly or not at all for long periods,so that the marine organisms that provide their food have a chance to multiply.If it were not for this faculty,they would devour all the food available in a short time and would probably starve themselves out of existence.5.But the most spectacular thing about the sea cucumber is the way it defends itself. Its major enemies are fish and crabs,when attacked,it squirts all its internal organs into water. It also casts off attached structures such as tentacles.The sea cucumber will eviscerate and regenerate itself if it is attacked or even touched;it will do the same if the surrounding water temperature is too high or if the water becomes too polluted.For a long time,sea cucumbers can live at a low metabolic rate and be______.A:extinctB:bizarreC:interestingD:inactive E:greedyF: reproduce
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共用题干
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共用题干
Ecosystem1. The word “ecosystem” is short for ecological（生态的）system. An ecosystem is where living creatures expand within a given area. You can say that an ecosystem is the natural environment where biological organisms（生物）such as plants,animals and humans co-exist in this world. So naturally that includes you and me. Yes,we are all members of an ecosystem!2 .There are different kinds of ecosystems depending on the type of surface or environ-ment. Most are naturally made such as the ocean or lake and the desert or rainforest.Some are man-made or artificial to encourage co-habitation（同居）between living and non-living things in a monitored environment,such as a zoo or garden.3 .Plants make up the biggest group of biological creatures within an ecosystem,and that's because they are the natural food producers for everyone. Plants raised in the earth need air and collect sunlight to help them grow. When they grow,the plants and its fruits or flowers eventually become a source of food to animals,microorganisms（微生物）and even hu- mans,of course. Food is then converted to energy for the rest of us to function,and this hap-pens in a never-ending cycle until the living creatures die and break up back in the earth.4 .Ecosystems are the basis of survival for all living things.We depend on plants and ani-mals for food. In order for us to exist,we need to grow and care about other organisms. We also need to care for the non-living things within our environment like our air and water so we can continue living as a population. Since plants,animals and humans are all of various species（物种）,we all play a role in maintaining the ecosystem.5 .To preserve our ecosystems,we should stop using too much energy,which happens when we consume more than our share of resources. Humans should not disturb the natural habitat（栖息地）of plants and animals,and allow them to grow healthily for the cycle to con-tinue. Too many people in a habitat can mean displacement（搬迁）: imagine being thrown out of your home because there is no more space for everyone. Worse,overpopulation can also ru- in the environment and cause destruction of existing plants and animals.Plants,animals and humans are all effective in______.A: our share of resourcesB: a biological creatureC: a given areaD: the maintenance of the ecosystemE: the source of foodF: various species
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共用题干
Ecosystem1. The word “ecosystem” is short for ecological（生态的）system. An ecosystem is where living creatures expand within a given area. You can say that an ecosystem is the natural environment where biological organisms（生物）such as plants,animals and humans co-exist in this world. So naturally that includes you and me. Yes,we are all members of an ecosystem!2 .There are different kinds of ecosystems depending on the type of surface or environ-ment. Most are naturally made such as the ocean or lake and the desert or rainforest.Some are man-made or artificial to encourage co-habitation（同居）between living and non-living things in a monitored environment,such as a zoo or garden.3 .Plants make up the biggest group of biological creatures within an ecosystem,and that's because they are the natural food producers for everyone. Plants raised in the earth need air and collect sunlight to help them grow. When they grow,the plants and its fruits or flowers eventually become a source of food to animals,microorganisms（微生物）and even hu- mans,of course. Food is then converted to energy for the rest of us to function,and this hap-pens in a never-ending cycle until the living creatures die and break up back in the earth.4 .Ecosystems are the basis of survival for all living things.We depend on plants and ani-mals for food. In order for us to exist,we need to grow and care about other organisms. We also need to care for the non-living things within our environment like our air and water so we can continue living as a population. Since plants,animals and humans are all of various species（物种）,we all play a role in maintaining the ecosystem.5 .To preserve our ecosystems,we should stop using too much energy,which happens when we consume more than our share of resources. Humans should not disturb the natural habitat（栖息地）of plants and animals,and allow them to grow healthily for the cycle to con-tinue. Too many people in a habitat can mean displacement（搬迁）: imagine being thrown out of your home because there is no more space for everyone. Worse,overpopulation can also ru- in the environment and cause destruction of existing plants and animals.In an ecosystem,plants,animals and humans live together in______.A: our share of resourcesB: a biological creatureC: a given areaD: the maintenance of the ecosystemE: the source of foodF: various species
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共用题干
Ecosystem1. The word “ecosystem” is short for ecological（生态的）system. An ecosystem is where living creatures expand within a given area. You can say that an ecosystem is the natural environment where biological organisms（生物）such as plants,animals and humans co-exist in this world. So naturally that includes you and me. Yes,we are all members of an ecosystem!2 .There are different kinds of ecosystems depending on the type of surface or environ-ment. Most are naturally made such as the ocean or lake and the desert or rainforest.Some are man-made or artificial to encourage co-habitation（同居）between living and non-living things in a monitored environment,such as a zoo or garden.3 .Plants make up the biggest group of biological creatures within an ecosystem,and that's because they are the natural food producers for everyone. Plants raised in the earth need air and collect sunlight to help them grow. When they grow,the plants and its fruits or flowers eventually become a source of food to animals,microorganisms（微生物）and even hu- mans,of course. Food is then converted to energy for the rest of us to function,and this hap-pens in a never-ending cycle until the living creatures die and break up back in the earth.4 .Ecosystems are the basis of survival for all living things.We depend on plants and ani-mals for food. In order for us to exist,we need to grow and care about other organisms. We also need to care for the non-living things within our environment like our air and water so we can continue living as a population. Since plants,animals and humans are all of various species（物种）,we all play a role in maintaining the ecosystem.5 .To preserve our ecosystems,we should stop using too much energy,which happens when we consume more than our share of resources. Humans should not disturb the natural habitat（栖息地）of plants and animals,and allow them to grow healthily for the cycle to con-tinue. Too many people in a habitat can mean displacement（搬迁）: imagine being thrown out of your home because there is no more space for everyone. Worse,overpopulation can also ru- in the environment and cause destruction of existing plants and animals.To protect our ecosystems we should not use more than______.A: our share of resourcesB: a biological creatureC: a given areaD: the maintenance of the ecosystemE: the source of foodF: various species
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Time in the Animal WorldRhythm controls everything in Nature._______(46)The sun provides a basic time rhythm for all living creatures including humans.Nearly all animals are influenced by sun cycles and have developed a biological clock in their bodies following these cycles.The moon also exerts its force and influence on the sea. Its gravitational attraction causes the rising of the tide._______(47)When the moon is behind the Earth,centrifugal force causes the second tide of the day.Animals living in tidal areas must have the instinct of predicting these changes,to avoid being stranded and dying of dehydration.Since the time of the dinosaurs,the king crab has been laying eggs at the seaside in a set way.To avoid predator fish,the eggs are always far from seawater and protected by sand.In the following two months,the eggs undergo dramatic changes related to the cycles of the moon.When the second spring tide comes,the young king crabs have matured._______(48)Most of the mammals,either the giant elephant or the small shrew,have the same average total number of heartbeats in their lifetime.Shrews live only for two and a half years,and spend their life at a high speed and high tempo.Animals like shrews with a pulse rate of 600 per minute have an average total of eight hundred million heartbeats throughout their life.The African elephant has a pulse rate of 25 beats per minute,and a life span of 60 years.The size of the body determines the speed of life._______(49)As we get older,our sense of time is being influenced by the physiological changes of our body.The elderly spend more time resting,and do few sports._______(50)For a child,a week is seen as a long time._________（46）A:For an adult,time goes fast year by year.B:It controls,for example,the flapping of birds' wings,the beating of the heart and the rising and setting of the sun.C:The larger the animal is,the longer its life span is and the slower its life tempo is.D:The tide goes out when the moon moves away and its attraction is weaker.E:We always tend to think all the animals have the same sense of time as human beings.F:The second spring tide takes them back to the sea.
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Ecosystem1. The word “ecosystem” is short for ecological（生态的）system. An ecosystem is where living creatures expand within a given area. You can say that an ecosystem is the natural environment where biological organisms（生物）such as plants,animals and humans co-exist in this world. So naturally that includes you and me. Yes,we are all members of an ecosystem!2 .There are different kinds of ecosystems depending on the type of surface or environ-ment. Most are naturally made such as the ocean or lake and the desert or rainforest.Some are man-made or artificial to encourage co-habitation（同居）between living and non-living things in a monitored environment,such as a zoo or garden.3 .Plants make up the biggest group of biological creatures within an ecosystem,and that's because they are the natural food producers for everyone. Plants raised in the earth need air and collect sunlight to help them grow. When they grow,the plants and its fruits or flowers eventually become a source of food to animals,microorganisms（微生物）and even hu- mans,of course. Food is then converted to energy for the rest of us to function,and this hap-pens in a never-ending cycle until the living creatures die and break up back in the earth.4 .Ecosystems are the basis of survival for all living things.We depend on plants and ani-mals for food. In order for us to exist,we need to grow and care about other organisms. We also need to care for the non-living things within our environment like our air and water so we can continue living as a population. Since plants,animals and humans are all of various species（物种）,we all play a role in maintaining the ecosystem.5 .To preserve our ecosystems,we should stop using too much energy,which happens when we consume more than our share of resources. Humans should not disturb the natural habitat（栖息地）of plants and animals,and allow them to grow healthily for the cycle to con-tinue. Too many people in a habitat can mean displacement（搬迁）: imagine being thrown out of your home because there is no more space for everyone. Worse,overpopulation can also ru- in the environment and cause destruction of existing plants and animals.Plants are essential in an ecosystem because to other living creatures they are______.A: our share of resourcesB: a biological creatureC: a given areaD: the maintenance of the ecosystemE: the source of foodF: various species
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Ecosystem1 The word " ecosystem" is short for ecological（生态的）system. An ecosystem is where living crea- tures expand within a given area.You can say that an ecosystem is the natural environment where biologicalorganisms（生物）such as plants,animals and humans co-exist in this world. So naturally that includes you and mne.Yes,we are all members of an ecosystem!2 There are different kinds of ecosystems depending on the type of suiface or environment. Most are naturally made 5uch as the ocean or lake and the desert or rainforest.Some are man-made or artificial to en- courage co-habitation（共居）between living and non-living things in a monitored environment,such as azoo or garden.3 Plants make up the biggest group of biological creatures within an ecosystem,and that's because they are the natural food producers for everyone.Plants raised in the earth need air and collect sunlight to help them grow.When they grow,the plants and their加its or flowers eventually become a source of food to animals,microorganisms (微生物）and even humans, of course. Food is then converted to energy for the rest of us to function,and this happens in a never-ending cycle until the living creatures die and break up back in the earth.4 Ecosystems are the basis of survival for all living things.We depend on plants and animals for food. In order for us to exist,we need to grow and care about other organisms.We also need tO care for the non一living things within our environment like our air and water so we can continue living as a population.Since plants, animals and humans are all of various species（物种）,we all play a role in maintaining the ecosystem.5 To preserve our ecosystems,we should stop using too much energy,which happens汕en we consume more than our share of resources. Humans should not disturb the natural habitat（栖息地）of plants and animals, and should allow them to grow healthily for the cycle to continue.Too many people in a habitat can mean dis- placement（搬迁）:imagine being thrown out of your home because there is no more space for everyone. Worse,overpopulation can also ruin the environment and cause destruction of existing plants and animals.Plants,animals and humans are all effective in________.A:our share of resoureesB:a biological creatureC:a given areaD:the maintenance of the ecosystemE:the source of foodF:various species
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Ecosystem1 The word " ecosystem" is short for ecological（生态的）system. An ecosystem is where living crea- tures expand within a given area.You can say that an ecosystem is the natural environment where biologicalorganisms（生物）such as plants,animals and humans co-exist in this world. So naturally that includes you and mne.Yes,we are all members of an ecosystem!2 There are different kinds of ecosystems depending on the type of suiface or environment. Most are naturally made 5uch as the ocean or lake and the desert or rainforest.Some are man-made or artificial to en- courage co-habitation（共居）between living and non-living things in a monitored environment,such as azoo or garden.3 Plants make up the biggest group of biological creatures within an ecosystem,and that's because they are the natural food producers for everyone.Plants raised in the earth need air and collect sunlight to help them grow.When they grow,the plants and their加its or flowers eventually become a source of food to animals,microorganisms (微生物）and even humans, of course. Food is then converted to energy for the rest of us to function,and this happens in a never-ending cycle until the living creatures die and break up back in the earth.4 Ecosystems are the basis of survival for all living things.We depend on plants and animals for food. In order for us to exist,we need to grow and care about other organisms.We also need tO care for the non一living things within our environment like our air and water so we can continue living as a population.Since plants, animals and humans are all of various species（物种）,we all play a role in maintaining the ecosystem.5 To preserve our ecosystems,we should stop using too much energy,which happens汕en we consume more than our share of resources. Humans should not disturb the natural habitat（栖息地）of plants and animals, and should allow them to grow healthily for the cycle to continue.Too many people in a habitat can mean dis- placement（搬迁）:imagine being thrown out of your home because there is no more space for everyone. Worse,overpopulation can also ruin the environment and cause destruction of existing plants and animals.Plants are essential in an ecosystem because to other living creatures they are___.A:our share of resoureesB:a biological creatureC:a given areaD:the maintenance of the ecosystemE:the source of foodF:various species
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How does NTP help you troubleshoot network problems?（）A、By calculating the time offset from the GPS or atomic clockB、By setting the router clock to the default value if the router can't connect to a time serverC、By setting all network devices to the correct timeD、By setting necessary time date in the timestamp information
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Which of the following server roles provides a common time to all computers？（）A、NTPB、SNMPC、SMTPD、RAS
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You are creating a Windows Forms application by using the .NET Framework 3.5. You create a new form in your application.You add 100 controls at run time in the Load event handler of the form. Users report that the form takes a long time to get displayed. You need to improve the performance of the form. What should you do？（）A、Call the InitLayout method of the form before adding all the controls.Call the PerformLayout method of the form after adding all the controls.B、Call the InitLayout method of the form before adding all the controls.Call the ResumeLayout method of the form after adding all the controls.C、Call the SuspendLayout method of the form before adding all the controls.Call the PerformLayout method of the form after adding all the controls.D、Call the SuspendLayout method of the form before adding all the controls.Call the ResumeLayout method of the form after adding all the controls.
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单选题A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?（）A
The motion of the apparent sun is along the eclipticB
Measurement of time is along the celestial equatorC
The speed of the Earth's revolution is not constantD
There are variations in the Earth's rotational speed
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问答题Pretend that you are a tourist from time to time, and get to know your city all over again including the indispensable（不可错过的）sights that people travel miles to see.
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