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单选题
（）forms over land，most frequently during autumn and winter over low-lying land，especially if it is damp and marshy and in valleys on quiet nights with clear skies.
A
FRONTAL FOG
B
MIXING FOG
C
ADVECTION FOG
D
RADIATION FOG
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更多 “单选题（）forms over land，most frequently during autumn and winter over low-lying land，especially if it is damp and marshy and in valleys on quiet nights with clear skies.A FRONTAL FOGB MIXING FOGC ADVECTION FOGD RADIATION FOG” 相关考题
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______ forms over land，most frequently during autumn and winter over low-lying land，especially if it is damp and marshy and in valleys on quiet nights with clear skies．A.FRONTAL FOGB.MIXING FOGC.ADVECTION FOGD.RADIATION FOG
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共用题干
Plants in DesertOnly special plants can survive the terrible climate of a desert,for these are regions where the annual range of the soil temperature can be over 75℃．Furthermore,during the summer there are few clouds in the sky to protect plants from the sun's ray.Another problem is the fact that there are frequently strong winds that drive small,sharp particles of sand into the plants,tearing and damaging them.The most difficult problem for all forms of plant life,however,is the fact that the entire annual rainfall occurs during a few days or weeks in spring.Grasses and flowers in desert survive from one year to the next by existing through the long,hot,dry season in the form of seeds.These seeds remain inactive unless the right amount of rain falls.If no rain falls,or if insufficient rain falls,they wait until the next year,or even still the next.Another factor that helps these plants to survive is the fact that their life cycles are short.By the time the water from the spring rains disappears-just a few weeks after it falls-such plants no longer need any.The perennials（多年生植物）have special features that enable them to survive as plants for several years.Thus,nearly all desert perennials have extensive root systems below ground and a small shoot system above ground.The large root network enables the plant to absorb as much water as possible in short time.The small shoot system,on the other hand,considerably limits water loss by evaporation（蒸发）.Another feature of many perennials is that after the rainy season they lose their leaves in preparation for the long,dry season,just as trees in wetter climates lose theirs in preparation for the winter.This reduces their water loss by evaporation during the dry season.Then,in next rainy season,they come fully alive once more,and grow new branches,leaves and flowers,just as the grasses and flowers in desert do.Winter is the toughest season for the grasses and flowers to survive.A:Right B:Wrong C:Not mentioned
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共用题干
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Very few of our birds stay with us the year round.Some come to us in the winter from the cold?north.Others come from the south to spend the summer with us.How do they know the way?Suppose?you were told to find your way to a place hundreds of miles away,do you think you could do it?
Yet birds travel over mountains,forests,lakes and even across the oceans,and do not stray from?the path.They find their way back in the spring to the same orchard（果园）and the very trees where?they nested the summer before.
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Why do birds undertake these long journeys twice a year?Perhaps cold weather and lack of?food drive them from us in the autumn,but we cannot tell why they leave the sunny south to come?back to us in the spring.We know only that many of them like to make their nests and rear their?young in the north.
We are sorry to see them go,but we know that when winter is over they will come back to us.
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B.In summer.
C.In winter.
D.We don't know.
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Very few of our birds stay with us the year round.Some come to us in the winter from the cold?north.Others come from the south to spend the summer with us.How do they know the way?Suppose?you were told to find your way to a place hundreds of miles away,do you think you could do it?
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Why do birds undertake these long journeys twice a year?Perhaps cold weather and lack of?food drive them from us in the autumn,but we cannot tell why they leave the sunny south to come?back to us in the spring.We know only that many of them like to make their nests and rear their?young in the north.
We are sorry to see them go,but we know that when winter is over they will come back to us.
Why do birds undertake those long journeys twice a year?A.It is because of cold weather in winter.
B.It is because of lack of food in autumn.
C.It is because of the hot weather in summer.
D.There's some reason that is still not known clearly.
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Most of the land belonging to the Saxons was confiscated by William and given to（）.A、the Norman baronsB、the DanesC、the IrishD、the Scots
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A branch office of Acme Insurance has 15 IP phones connected to the main office using the distributed call processing model. Normally， the phones work with great quality. However， during very busy times when all of the agents are on the phone at the same time， the voice quality drops precipitously. Words or phrases or both are dropped from conversations. What is the most likely cause of the problem？（）A、large files are being downloaded over the WAN networkB、IP phone traffic is not being classified correctlyC、more bandwidth is required for the office LAND、Call Admission Control has not been implemented E、employees are watching videos over the internetF、header compression is not being used
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stronger than during the summer monthsB
weaker than during the summer monthsC
drier than during the summer monthsD
wetter than during the summer months
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单选题In many areas atoll clouds (clouds of vertical development) are produced over small islands. These are the result of（）.A
rising air currents produced by the warm islandsB
warm air from the sea rising over higher land areasC
cool land air mixing with warm sea airD
descending air over the islands
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单选题An “atoll cloud” forming over an island due to heating of the land during the daytime would be which type? （）A
CirrusB
CumulusC
StratusD
Nimbus
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TornadoB
WaterspoutC
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单选题Radiation fog（）.A
always forms over waterB
is formed by a temperature inversionC
is thinnest at the surfaceD
dissipates during the evening
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单选题In grammar practice, substitution and ________drills are most frequently used in mechanical practice.A
meaningB
matchingC
correctionD
transformation
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单选题The teacher told the children there ______ four seasons in a year: spring, summer, autumn and winter.A
isB
wasC
areD
were
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单选题The phraseeven in winter(Lines 8~9)most nearly means _____.A
if the winter is especially warmB
during all of the year except the winterC
in winter as well as in other seasonsD
during the evenings in winter
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单选题Which is the winter load waterline on the load waterline mark?（）.A
The line over the summer load waterlineB
The line above the tropical load waterlineC
The line below the tropical load waterlineD
The line between the summer and the winter north Atlantic load waterline
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填空题Worldwide rainfall over land has increased by about one percent.____
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