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A、Lightning and thunder. B、A great deal of water vapor and a rapidly rising air current. C、Warm air and cold air. D、A great amou
A、Lightning and thunder. B、A great deal of water vapor and a rapidly rising air current. C、Warm air and cold air. D、A great amou
admin
2012-10-30
75
问题
Thunderstorms are the 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 energy to 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、A great deal of water vapor and a rapidly rising air current.
C、Warm air and cold air.
D、A great amount of vapor and electricity.
答案
C
解析
[听力原文]
What are the two conditions that must exist for thunderstorms to develop?
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。
转载请注明原文地址:https://kaotiyun.com/show/3Iw7777K
0
大学英语四级
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