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A、Lightning-and thunder. B、Warm air and cold air. C、A great deal of water vapor and a rapidly rising air current. D、A great amou
A、Lightning-and thunder. B、Warm air and cold air. C、A great deal of water vapor and a rapidly rising air current. D、A great amou
admin
2010-01-10
24
问题
Thunderstorms are file least dangerous and least violent of all the storms. Almost everyone has experienced a thunderstorm with its heavy rains, high winds, lightning and accompanying thunder. This type of storm can release a great deal of energy. A single thunderstorm can release energyt9 the atmosphere equivalent to a hydrogen bomb. There are some 50,000 thunderstorms that occur on earth daily. This would make the daily energy released into the atmosphere equal to billions of tons of TNT.
Certain conditions must exist for thunderstorms to develop. First, the air must contain a great deal of water vapor. Second, there must be a rapidly rising air current. Thunderstorms may produce lightning and thunder. Lightning is a result of the rapidly rising air. The temperature produced by lightning is nearly 50,000 degrees Fahrenheit. This tremendous amount of heat causes the air to expand suddenly. This causes sound waves to be produced in the air which are heard as a crashing or loud noise called thunder.
选项
A、Lightning-and thunder.
B、Warm air and cold air.
C、A great deal of water vapor and a rapidly rising air current.
D、A great amount of vapor and electricity.
答案
C
解析
信息明示题,文章第二段开头指出,the air must contain a great deal of water vapor... must be a rapidly rising air current (空气中必须包含大量的水气…还要有快速上升的气流),由此可知C正确
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0
大学英语四级
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