38. What is TRUE about lightning according to the passage?
Only a small number of lightning flashes occur on earth.
Lightning travels 5 minutes faster than thunder.
Lightning flashes usually jump from one cloud to another.
There are far more lightning strikes occurring on earth than we imagine.
39. The word activity is most closely related to the word _____.
cloud lightning flashes
lightning strikes thunderstorms
40. It can be concluded from the passage that ______.
we should not believe what we see or hear
things moving downward are more noticeable
people often have wrong concepts about ordinary phenomena
adults are not as good as children in observing certain natural phenomena
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