What is the main topic of the passage? What can be inferred about drops of water larger than 0. 008 inch in diameter?

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问题 What is the main topic of the passage?
What can be inferred about drops of water larger than 0. 008 inch in diameter?

选项 A、They never occur.
B、They are not affected by the force of gravity.
C、In still air they would fall to earth.
D、In moving air they fall at a speed of thirty-two miles per hour.

答案C

解析 第2段5、6两行点明题意。
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