4. What is TRUE about lightning according to the passage?
A. Only a small number of lightning flashes occur on earth.
B. Lightning travels 5 times faster than thunder.
C. Lightning flashes usually jump from one cloud to another.
D. There are far more lightning strikes occurring on earth than we can imagine.
讲解答案:
4. A是非题。由文章第三段第一句话可知,大多数闪电一般在石电发生时有,在地面和云之间跳跃。因此C、D是镨的。对于B,或许会受第四段中but the sound of the thunder takes about 5 seconds to travel just one mile的影响,但事实并不相符,因此选A。
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