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-般在石电发生 也有。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 ol 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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