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Chemistry is the study of the behavior and composition of matter. All foods aremade up of chemical substance which undergoes chemical changes when cooking 1．______in an oven or digested within the body. The cooking of meat and vegetables induce 2．______chemical changes, making it more delicious; similarly the leavening action of 3．______baking powder is a straightforward chemical change, as is the conversion ofstarch into sweet sugars by digestion.Cookery is a science requiring a knowledge of chemistry. 4．______This is evident from the variety of cooking products and food additives availableas cooking oils, fats, colorings, sweeteners, tenderizers, flavorings, screamingagents, preservatives, etc. Each is carefully prepared before painstaking 5．______research. It is therefore essential for trained cookers to understand 6．______chemical science in order to appreciate the chemistry nature of foods 7．______and the changes achieving on cooking. Homeworkers should also 8．______know cleansing agents and textiles used in the home and how the latter 9．______responds to the effects of heat, light, water, and chemical cleansing agents. 10．______
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更多 “问答题Chemistry is the study of the behavior and composition of matter. All foods aremade up of chemical substance which undergoes chemical changes when cooking 1．______in an oven or digested within the body. The cooking of meat and vegetables induce 2．______chemical changes, making it more delicious; similarly the leavening action of 3．______baking powder is a straightforward chemical change, as is the conversion ofstarch into sweet sugars by digestion.Cookery is a science requiring a knowledge of chemistry. 4．______This is evident from the variety of cooking products and food additives availableas cooking oils, fats, colorings, sweeteners, tenderizers, flavorings, screamingagents, preservatives, etc. Each is carefully prepared before painstaking 5．______research. It is therefore essential for trained cookers to understand 6．______chemical science in order to appreciate the chemistry nature of foods 7．______and the changes achieving on cooking. Homeworkers should also 8．______know cleansing agents and textiles used in the home and how the latter 9．______responds to the effects of heat, light, water, and chemical cleansing agents. 10．______” 相关考题
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They use special chemical substance to _________ the growth of crops.A aggravateB accelerateC strengthenD reinforce
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We get energy from the foods we eat.Our food supplies energy to keep our organs working.Our food also supplies heat to warm our bodies.The main energy foods are the carbohydrates (碳水化合物).These are the sugars and starches(淀粉). Wheat and rice are rich in starch and many fruits and vegetables contain considerable amount of sugar. Sweets, honey and jam are also rich in sugar.Like carbohydrates, fats are food that provides us with energy. Butter, margarine, certain types of fish, eggs, cooking oils and most red meats are rich in fats. Fats can be stored in various parts of the body as reserves of energy. Because fats in general are slowly digested, they satisfy hunger for long periods.Proteins (蛋白质) are very complex substances. The body needs proteins for the growth of new cells and for the repair and replacement of old cells. Foods rich in proteins are essential to a balanced diet. Milk, some vegetables, meat, chicken, fish, cheese, grains and nuts are some foods rich in proteins.A good diet will contain a variety of foods so that the body contains all the minerals it needs for good health.Vitamins are necessary for the proper working of the body. If we eat a variety of foods, we can be sure of obtaining all the vitamins we need.Water makes up about 70 per cent of the weight of the human body. The average adult needs about two liters of water daily to replace the water the body loses.1.Of the following substances, which are not used as sources of energy by living things?()A. StarchesB. VitaminsC. ProteinsD. Fats2.If equal weight of the following substances is “burned” in the body,A. carbohydratesB. fatsC. vitaminsD. mineral salts3.A boy grows five centimeters a year.The new materialA. fatsB. vitaminsC. proteinsD.carbohydrates4.Which of the following is not true?()A. If a man weighs 150 pounds, 105 pounds are water.B. Apple, butter and meat are rich in proteins.C. A well-balanced diet contains proteins, fats, minerals and vitamins.D. Biscuits, cake and sweets may provide us with energy.5.People can get all the minerals the body needs by().A. having a balanced dietB. drinking more milkC. eating fruits and vegetablesD. having more fish and eggs
考题
Which of the following documents should always be kept up－to－date after any major changes aremade to a network backbone?()
A. Network diagramB. Performance baselineC. Network security procedureD. Company policy
考题
Spontaneous combustion is caused by ______．A.An outside heat source heating a substance until it ignitesB.Conduction of heat through a wall of material to the substanceC.Chemical action within a substanceD.All of the above
考题
Which statement is TRUE concerning the flash point of a substance ________．A.It is lower than the ignition temperatureB.It is the temperature at which a substance will spontaneously igniteC.It is the temperature at which a substance，when ignited，will continue to burnD.It is the temperature at which the released vapors will fall within the explosive range
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Which of the following may be used in cleaning up an oil spill without the permission of governmental authorities ________．A.Straw and Skimmers onlyB.Skimmers and Chemical dispersants onlyC.Straw and Chemical dispersants onlyD.Straw，Skimmers and Chemical dispersants
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第二篇Night of the Living AntsWhen an ant dies,other ants move the dead insect out of the nest.This behavior is interesting to scien-tists,who wonder how ants know for sure一and so soon一that another ant is dead.Dong-Hwan Choe,a scientist at the University of California,found that Argentine ants have a chemical on the outside of their bodies that signals to other ants,"I'm dead一take me away."But there's a twist to Choe's discovery. These ants behave a little bit like zombies（僵尸）.Choe says that the living ants一not just the dead ones一have this death chemicals. In other words,while an ant crawls around,perhaps in a picnic or home,it's telling other ants that it's dead.What keeps ants from hauling away the living dead? Choe found that Argentine ants have two additional chemicals on their bodies,and these tell nearby ants something like,"Wait一I'm not dead yet."So Choe's research turned up two sets of chemical signals in ants:one says,"I'm dead,"the other set says,"I'm not dead yet."Other scientists have tried to figure out how ants know when another ant is dead.If an ant is knockedunconscious,other ants leave it alone until it wakes up.That means ants know that unmoving ants can still be alive.Choe suspects that when an Argentine ant dies,the chemical that says"Wait一I'm not dead yet"quickly goes away. Once that chemical is gone,only the one that says"I'm dead"is left."It's because the dead ant no longer smells like a living ant that it gets carried to the graveyard（墓地）,not because its body releases new,unique chemicals after death,"said Choe.When other ants detect the"dead"chemical without the"not dead yet" chemical,they haul away the body. This was Choe's hypothesis（假设）.To test his hypothesis,Choe and his team put different chemicals on Argentine ant pupae（蛹）.When the scientists used the"I'm dead"chemical,other ants quickly hauled the treated pupae away.When the sci-entists used the"Wait一I'm not dead yet"chemical,other ants left the treated pupae alone.Choe believes this behavior shows that the" not dead yet" chemical overrides（优先于）the" dead" chemical when picked up by adult ants.And that when an ant dies,the"not dead yet"chemical fades away.Other nearby ants then de-tect the remaining"dead"chemical and remove the body from the nest.According to Choe's hypothesis,_______________.A:an ant still smells like a living one when it diesB:the"I am dead"chemical leaves the ant's body when it diesC:the"I am not dead yet"chemical is left when an ant diesD:the"I am not dead yet"chemical quickly goes away when it dies
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第二篇Night of the Living AntsWhen an ant dies,other ants move the dead insect out of the nest.This behavior is interesting to scien-tists,who wonder how ants know for sure一and so soon一that another ant is dead.Dong-Hwan Choe,a scientist at the University of California,found that Argentine ants have a chemical on the outside of their bodies that signals to other ants,"I'm dead一take me away."But there's a twist to Choe's discovery. These ants behave a little bit like zombies（僵尸）.Choe says that the living ants一not just the dead ones一have this death chemicals. In other words,while an ant crawls around,perhaps in a picnic or home,it's telling other ants that it's dead.What keeps ants from hauling away the living dead? Choe found that Argentine ants have two additional chemicals on their bodies,and these tell nearby ants something like,"Wait一I'm not dead yet."So Choe's research turned up two sets of chemical signals in ants:one says,"I'm dead,"the other set says,"I'm not dead yet."Other scientists have tried to figure out how ants know when another ant is dead.If an ant is knockedunconscious,other ants leave it alone until it wakes up.That means ants know that unmoving ants can still be alive.Choe suspects that when an Argentine ant dies,the chemical that says"Wait一I'm not dead yet"quickly goes away. Once that chemical is gone,only the one that says"I'm dead"is left."It's because the dead ant no longer smells like a living ant that it gets carried to the graveyard（墓地）,not because its body releases new,unique chemicals after death,"said Choe.When other ants detect the"dead"chemical without the"not dead yet" chemical,they haul away the body. This was Choe's hypothesis（假设）.To test his hypothesis,Choe and his team put different chemicals on Argentine ant pupae（蛹）.When the scientists used the"I'm dead"chemical,other ants quickly hauled the treated pupae away.When the sci-entists used the"Wait一I'm not dead yet"chemical,other ants left the treated pupae alone.Choe believes this behavior shows that the" not dead yet" chemical overrides（优先于）the" dead" chemical when picked up by adult ants.And that when an ant dies,the"not dead yet"chemical fades away.Other nearby ants then de-tect the remaining"dead"chemical and remove the body from the nest.The passage"Night of the Living Ants"tells us about_______________.A:how an ant is moved out of the nest at nightB:what an ant does at nightC:how an ant finds its way in darknessD:what happens when an ant dies
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第二篇Night of the Living AntsWhen an ant dies,other ants move the dead insect out of the nest.This behavior is interesting to scien-tists,who wonder how ants know for sure一and so soon一that another ant is dead.Dong-Hwan Choe,a scientist at the University of California,found that Argentine ants have a chemical on the outside of their bodies that signals to other ants,"I'm dead一take me away."But there's a twist to Choe's discovery. These ants behave a little bit like zombies（僵尸）.Choe says that the living ants一not just the dead ones一have this death chemicals. In other words,while an ant crawls around,perhaps in a picnic or home,it's telling other ants that it's dead.What keeps ants from hauling away the living dead? Choe found that Argentine ants have two additional chemicals on their bodies,and these tell nearby ants something like,"Wait一I'm not dead yet."So Choe's research turned up two sets of chemical signals in ants:one says,"I'm dead,"the other set says,"I'm not dead yet."Other scientists have tried to figure out how ants know when another ant is dead.If an ant is knockedunconscious,other ants leave it alone until it wakes up.That means ants know that unmoving ants can still be alive.Choe suspects that when an Argentine ant dies,the chemical that says"Wait一I'm not dead yet"quickly goes away. Once that chemical is gone,only the one that says"I'm dead"is left."It's because the dead ant no longer smells like a living ant that it gets carried to the graveyard（墓地）,not because its body releases new,unique chemicals after death,"said Choe.When other ants detect the"dead"chemical without the"not dead yet" chemical,they haul away the body. This was Choe's hypothesis（假设）.To test his hypothesis,Choe and his team put different chemicals on Argentine ant pupae（蛹）.When the scientists used the"I'm dead"chemical,other ants quickly hauled the treated pupae away.When the sci-entists used the"Wait一I'm not dead yet"chemical,other ants left the treated pupae alone.Choe believes this behavior shows that the" not dead yet" chemical overrides（优先于）the" dead" chemical when picked up by adult ants.And that when an ant dies,the"not dead yet"chemical fades away.Other nearby ants then de-tect the remaining"dead"chemical and remove the body from the nest.Which of the following statements is NOT true of ants?A:Ants know very soon that?another ant is dead.B:When an ant is dead,others move its body out of the nest.C:If an ant is unconscious,it is moved out of the nest.D:Living ants have the"I'm dead"chemical on their bodies.
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第二篇Night of the Living AntsWhen an ant dies,other ants move the dead insect out of the nest.This behavior is interesting to scien-tists,who wonder how ants know for sure一and so soon一that another ant is dead.Dong-Hwan Choe,a scientist at the University of California,found that Argentine ants have a chemical on the outside of their bodies that signals to other ants,"I'm dead一take me away."But there's a twist to Choe's discovery. These ants behave a little bit like zombies（僵尸）.Choe says that the living ants一not just the dead ones一have this death chemicals. In other words,while an ant crawls around,perhaps in a picnic or home,it's telling other ants that it's dead.What keeps ants from hauling away the living dead? Choe found that Argentine ants have two additional chemicals on their bodies,and these tell nearby ants something like,"Wait一I'm not dead yet."So Choe's research turned up two sets of chemical signals in ants:one says,"I'm dead,"the other set says,"I'm not dead yet."Other scientists have tried to figure out how ants know when another ant is dead.If an ant is knockedunconscious,other ants leave it alone until it wakes up.That means ants know that unmoving ants can still be alive.Choe suspects that when an Argentine ant dies,the chemical that says"Wait一I'm not dead yet"quickly goes away. Once that chemical is gone,only the one that says"I'm dead"is left."It's because the dead ant no longer smells like a living ant that it gets carried to the graveyard（墓地）,not because its body releases new,unique chemicals after death,"said Choe.When other ants detect the"dead"chemical without the"not dead yet" chemical,they haul away the body. This was Choe's hypothesis（假设）.To test his hypothesis,Choe and his team put different chemicals on Argentine ant pupae（蛹）.When the scientists used the"I'm dead"chemical,other ants quickly hauled the treated pupae away.When the sci-entists used the"Wait一I'm not dead yet"chemical,other ants left the treated pupae alone.Choe believes this behavior shows that the" not dead yet" chemical overrides（优先于）the" dead" chemical when picked up by adult ants.And that when an ant dies,the"not dead yet"chemical fades away.Other nearby ants then de-tect the remaining"dead"chemical and remove the body from the nest.According to Paragraph 7,what is the result. of the test on Choe's hypothesis? A:It shows that his hypothesis is wrong.B:It proves that his hypothesis is convincing.C:It suggests that his hypothesis needs revising.D:Not enough evidence has been found to support his hypothesis.
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第二篇Night of the Living AntsWhen an ant dies,other ants move the dead insect out of the nest.This behavior is interesting to scien-tists,who wonder how ants know for sure一and so soon一that another ant is dead.Dong-Hwan Choe,a scientist at the University of California,found that Argentine ants have a chemical on the outside of their bodies that signals to other ants,"I'm dead一take me away."But there's a twist to Choe's discovery. These ants behave a little bit like zombies（僵尸）.Choe says that the living ants一not just the dead ones一have this death chemicals. In other words,while an ant crawls around,perhaps in a picnic or home,it's telling other ants that it's dead.What keeps ants from hauling away the living dead? Choe found that Argentine ants have two additional chemicals on their bodies,and these tell nearby ants something like,"Wait一I'm not dead yet."So Choe's research turned up two sets of chemical signals in ants:one says,"I'm dead,"the other set says,"I'm not dead yet."Other scientists have tried to figure out how ants know when another ant is dead.If an ant is knockedunconscious,other ants leave it alone until it wakes up.That means ants know that unmoving ants can still be alive.Choe suspects that when an Argentine ant dies,the chemical that says"Wait一I'm not dead yet"quickly goes away. Once that chemical is gone,only the one that says"I'm dead"is left."It's because the dead ant no longer smells like a living ant that it gets carried to the graveyard（墓地）,not because its body releases new,unique chemicals after death,"said Choe.When other ants detect the"dead"chemical without the"not dead yet" chemical,they haul away the body. This was Choe's hypothesis（假设）.To test his hypothesis,Choe and his team put different chemicals on Argentine ant pupae（蛹）.When the scientists used the"I'm dead"chemical,other ants quickly hauled the treated pupae away.When the sci-entists used the"Wait一I'm not dead yet"chemical,other ants left the treated pupae alone.Choe believes this behavior shows that the" not dead yet" chemical overrides（优先于）the" dead" chemical when picked up by adult ants.And that when an ant dies,the"not dead yet"chemical fades away.Other nearby ants then de-tect the remaining"dead"chemical and remove the body from the nest.What is meant by"death chemical"mentioned in Paragraph 3?A:A chemical that contains poison.B:A chemical that causes death.C:A chemical that announces death.D:A chemical that prevents death.
考题
Consequently,there has been a growing interest in natural foods:foods which do not contain additives and which have not been（ ）by chemical fertilizers widely used in farming today.A.effected
B.interfered
C.disturbed
D.affected
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Natural FoodIncreasingly,over the past ten years,people一especially young people一have become aware of the need to change their eating________(51),because much of the food they eat,particularly processed foods,is not good________(52)the health.Consequently,there has been a growing ________(53)in natural foods;foods which do not________(54)chemical additives and which have not been________(55)by chemical fertilizers,widely used in farming today.Natural foods,for example,are vegetables,fruit and grain which have been grown in soil that is rich in organic matter. In simple________(56),this means that the soil has been________ (57)by unused vegetable matter,which provides it with essential vitamins and minerals________ (58)in itself is a natural process compared with the use of chemicals and fertilizers,the main ________(59)of which is to increase the________(60)(but not the quality)of foods grown incommercial farming areas.Natural foods also include animals which have been________(61)to feed and move freely in healthy________(62).Compare this with what happens in the________(63)production of poultry （家禽）:there are battery farms,for example,where thousands of chickens live crowded together in one building and are fed________(64)food which is little better than rubbish.Chickens kept in this way are not only tasteless as food;they also produce eggs which________(65)important vitamins._________(52)A:to B:withC:for D:about
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第三篇Why So Risky in Chemical FactoriesWhich is safer一staying at home,traveling to work on public transport,or working in the office?Surprisingly,each of these carries the same risk,which is very low. However,what about flying compared to working in the chemical industry?Unfortunately,the former is 65 times riskier than the latter!In fact,the accident rate of workers in the chemical industry is less than that of almost any of human activity,and almost as safe as staying at home.The trouble with the chemical industry is that when things go wrong they often cause death to those living nearby.It is this which makes chemical accidents so newsworthy.Fortunately,they are extremely rare.The most famous ones happened at Texas City(1947),Flixborough(1974),Seveso (1976),Pemex(1984)and Bhopal(1984).Some of these are always in the minds of the people even though the loss of life was small.No one died at Seveso,and only 28 workers at Flixborough.The worst accident of all was Bhopal,where up to 3,000 were killed.The Texas City explosion of fertilizer killed 552.The Pemex fire at a storage plant for natural gas in the suburbs of Mexico City took 542 lives,just a month before the unfortunate event at Bhopal.Some experts have discussed these accidents and used each accident to illustrate a particular danger. Thus the Texas City explosion was caused by tons of ammonium nitrate（硝酸铵）,which is safe unless stored in great quantity.The Flixborough fireball was the fault of management,which took risks to keep production going during essential repairs.The Seveso accident shows what happens if the local authorities lack knowledge of the danger on their doorstep.When the poisonous gas drifted over the town,local leaders were incapable of taking effective action.The Pemex fire was made worse by an overloaded site in an overcrowded suburb.The fire set off a chain reaction of exploding storage tanks.Yet,by a miracle,the two largest tanks did not explode.Had these caught fire,then 3,000 strong rescue team and fire fighters would all have died.From the passage we know that ammonium nitrate is a kind of________.A:natural gas,which can easily catch fireB:fertilizer,which can't be stored in a great quantityC:poisonous substance,which can't be used in overcrowded areasD:fuel,which is stored in large tanks
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Which of the following is true when Bob, a technician, is setting default security permissions on a folder?（）A、There are no significant changes to other files.B、The created folder inherits the most restrictive permissions within the folder.C、The permissions are inherited by all files and folders within that folder.D、All folders within that folder are given a restrictive password.
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Which of the following documents should always be kept up-to-date after any major changes aremade to a network backbone?（）A、Network diagramB、Performance baselineC、Network security procedureD、Company policy
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问答题Chemistry is the study of the behavior and composition of matter. All foods aremade up of chemical substance which undergoes chemical changes when cooking 1．______in an oven or digested within the body. The cooking of meat and vegetables induce 2．______chemical changes, making it more delicious; similarly the leavening action of 3．______baking powder is a straightforward chemical change, as is the conversion ofstarch into sweet sugars by digestion.Cookery is a science requiring a knowledge of chemistry. 4．______This is evident from the variety of cooking products and food additives availableas cooking oils, fats, colorings, sweeteners, tenderizers, flavorings, screamingagents, preservatives, etc. Each is carefully prepared before painstaking 5．______research. It is therefore essential for trained cookers to understand 6．______chemical science in order to appreciate the chemistry nature of foods 7．______and the changes achieving on cooking. Homeworkers should also 8．______know cleansing agents and textiles used in the home and how the latter 9．______responds to the effects of heat, light, water, and chemical cleansing agents. 10．______
考题
单选题A (n) （） is a chemical or electro-chemical attack on the metal surface which may be further increased if the sea-water is polluted.A
erosionB
corrosionC
cavityD
scouring
考题
单选题Eventually chemical changes（）the generation of petroleum.A
hand inB
give inC
take inD
result in
考题
问答题Chemistry is the study of the behavior and composition of matter. All foodsare made up of chemical substance which undergoes chemical changes when cooking 1．_______in an oven or digested within the body. The cooking of meat and vegetables induce 2．_______chemical changes, making it more delicious; similarly the leavening action of 3．_______baking powder is a straightforward chemical change, as is the conversion ofstarch into sweet sugars by digestion. Cookery is a science requiring for a knowledge of chemistry. 4．_______This is evident from the variety of cooking products and food additives availableas cooking oils, fats, colorings, sweeteners, tenderizers, flavorings, scream-ing agents, preservatives, etc. Each is carefully prepared before painstaking 5．_______research. It is therefore essential for trained cookers to understand 6．_______chemical science in order to appreciate the chemistry nature of foods 7．_______and the changes achieving on cooking. Homeworkers should also 8．_______know cleansing agents and textiles used in the home and how the latter 9．_______responds to the effects of heat, light, water, and chemical cleansing agents. 10．_______
考题
单选题When you become frightened, many physical changes occur within your body. Your heartbeat and responses quicken; your pupils dilate(扩大 and _______more light.A
permitB
allowC
admitD
let
考题
单选题A portable dry chemical fire extinguisher discharges by（）.A
gravity when the extinguisher is turned upside downB
pressure from a small CO2 cartridge on the extinguisherC
air pressure from the hand pump attached to the extinguisherD
pressure from the reaction when water is mixed with the chemical
考题
单选题Which of the following statements is correct concerning the “flash point ” of a liquid?（）A
It is lower than the ignition temperatureB
It is the temperature at which a substance will spontaneously igniteC
It is the temperature at which a substance, when ignited, will continue to bumD
It is the temperature at which the released vapors will fall within the explosive range
考题
单选题Which of the following is true when Bob, a technician, is setting default security permissions on a folder?（）A
There are no significant changes to other files.B
The created folder inherits the most restrictive permissions within the folder.C
The permissions are inherited by all files and folders within that folder.D
All folders within that folder are given a restrictive password.
考题
问答题Practice 5 If you think American cooking means opening a package and tossing the contents into the microwave, think again. On the one hand, it's true that Americans thrive on cold cereal for breakfast, sandwiches for lunch and instant dinners. From busy homemakers to professional people, many Americans enjoy the convenience of prepackaged meals that can be ready to serve in 10 minutes or less. On the other hand, many Americans recognize the value of cooking skills. Most Americans will admit that there's nothing better than a good home-cooked meal. Probably every cook has his or her own cooking style. But there are some basic techniques and principles that most people follow. For example, baking is a primary method of preparing food in America. The dinner menu often has roast meats and other baked goods. For that reason, Americans would find it next to impossible to live without an oven. American cooks give special attention to the balance of foods, too. In planning a big meal they try to include a meat, a few vegetables, some bread or pasta and often a dessert. They also like to make sure the meal is colorful. Having several different colors of food on the plate usually makes for a healthy meal.
考题
单选题Every field of chemistry _____ different chemical reactions.A
holdsB
consistsC
composesD
involves
考题
单选题The process that occurs when heat is generated by a chemical reaction within a substance and continues to a point of ignition is known as （）.A
chemical ignitionB
spontaneous combustionC
chemical combustionD
radiation ignition
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