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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 islands
B . warm air from the sea rising over higher land areas
C . cool land air mixing with warm sea air
D . descending air over the island
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On a clear，warm day，you notice the approach of a tall cumulus cloud. The cloud top has hard well defined edges and rain is falling from the dark lower edge. Should this cloud pass directly overhead（）.
A . it will be preceded by a sudden increase in wind speed
B . it will be preceded by a sudden decrease in wind speed
C . the wind speed will not change as it passes
D . the wind will back rapidly to left in a counterclockwise direction as it passe
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We watched the plane（）behind the clouds.
A . disappearing
B . disappeared
C . diving
D . dived
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The heavy rain（）the road.
A . hurt
B . injured
C . damaged
D . hazard
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The rain was heavy and（）the visibility became very poor.
A . onsequently
B . constantly
C . continuously
D . consistently
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The rain stopped and the sun（）to shine.
A . came down
B . came out
C . came off
D . came o
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The rain was（）make our picnic impossible.
A . hard enough
B . hard so to
C . so hard as to
D . so hard to
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The inner cloud bands of a hurricane，when viewed from a distance，form a mass of dense，black cumulonimbus clouds called the（）.
A . bar of the storm
B . eye of the storm
C . funnel
D . front
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The eye of a hurricane is surrounded by dense black cumulonimbus clouds which are called the（）.
A . Wall cloud
B . Nimbostratus cloud
C . Bar
D . Funnel
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（）rain means it rains in some parts of the area.
A . Squally
B . Isolated
C . Scattered
D . Occasional
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The moon was obscured by thick clouds.
A . held
B . prevented
C . darkened
D . blackened
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After so many days without rain, the ground quickly（）the little rain that fell last night.
A、dropped
B、flooded
C、grasped
D、absorbed
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Clouds with the prefix “nimbo” in their name（）.
A . are sheet or layer clouds
B . have undergone great vertical development
C . are middle or high altitude clouds
D . are rain cloud
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A cloud sequence of cirrus，cirrostratus，and altostratus clouds followed by rain usually signifies the approach of a(n)（）.
A . occluded front
B . stationary front
C . warm front
D . cold front
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In the end of the plane _____ into the clouds.
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Within the painting there is the night sky filled with clouds.
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___the clouds, you would find the airplane inthe sky easily
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______ the clouds, you would find the airplane in the sky easily
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The travelers are really unlucky to be caught in the rain, for it does not often rain in the South Seas.
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It is going to rain soon, as there are dark clouds _________ our heads.
A、on
B、beyond
C、far from
D、over
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What are the ideal conditions for creating clouds？
A．The temperature is as low as minus 235 degrees Fahrenheit.
B．The air is a million times drier than that of Sahara.
C．Extremely dry air and low enough temperature.
D．A mild climate and the build-up of carbon dioxide.
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From Dr. R. S. Scorer of Britain’s Imperial College of Science comes the latest theory about the cause of lightening flashes. Dr. Scorer believes the cause is hail falling through super - cooled clouds, lee particles bouncing off the falling hail acquire a positive charge and rise to the top of the cloud while the hail carries a negative charge to the bottom of the cloud.
According to Dr. Scorer, Benjamin Franklin first proved thunderclouds are charged with electricity. Later investigation showed that the tops of the clouds have a great positive charge and the bottoms a great negative charge.
When the charges become great enough to break down the insulating properties of the air, lightening flashes carry the electricity within the cloud, or from cloud to cloud, or from cloud to earth. But the question remained: how do the charges develop within the cloud？
To seek the cause, Dr. Scorer and his colleagues at the college first duplicated thundercloud currents in a liquid tank. They doubt that mixture takes place only in the tops of the clouds.
Next a study of thunderclouds over the North Atlantic showed that lightening occurs only when the air temperature around the cloud is below freezing. Particles at the top of the cloud begin to freeze, but those in the remainder of the cloud stay unfrozen although below freezing temperature.
To measure moisture, the scientists sent planes equipped with external refrigerated rods into the clouds. The idea was that moisture would freeze on the rods and could later be measured. The men found, however, that some of the moisture particles bounced off the rods. This accidental discovery set the scientists on a new course of action.
In the laboratory, S. E. Reynolds whirled a refrigerated rod through ice particles and found that the particles bounced off the rod acquired a positive charge. This was the missing link. Without hail and super-cooled clouds, he concluded there could be no lightening.
According to the article, Benjamin Franklin was the first to prove that _______.
A．lightening is caused by hail falling through super - cooled clouds
B．thunderclouds are not charged with electricity
C．thunderclouds are charged with electricity
D．lightening was not an invention of the devil
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In England, people often talk about the weather because they an experience four seasons in one day In the morning the weather is warm just like in spring.An hour later black clouds come and then it rains hard The weather gets a little cold.In the late afternoon the sky will be sunny, the sun will begin to shine, and it will be summer at this time of a day.In England, people can also have summer in winter, or have winter in summer.So in winter they can swim sometimes, and in summer
sometimes they should take warm clothes.When you go to England, you will see that some English people usually take an umbrella or a raincoat with them in the sunny morning.
but you should not laugh at them.If you don't take an umbrella or a rain coat, you will regret later in the day.
6.People in England often talk about the weather，because the sky is sunny all day.()
A.T
B.F
7.From the story we know that when black clouds come，there is a heavy rain.()
A.T
B.F
8.The sentence “People can also have summer in winter.”means “it is sometimes too warm in winter.”()
A.T
B.F
9.In the sunny morning some English people usually take a raincoat or an umbrella with them because their friends ask them to do so.()
A.T
B.F
10.The best title for this passage is Summer or Winter in England.()
A.T
B.F
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The pilot increased the altitude of the airplane in order to avoid the rain clouds（）
A．number
B．speed
C．weight
D．height
