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  3. What is the main topic of the passage? Ice crystals do NOT immediately fall to Earth because ______.

What is the main topic of the passage? Ice crystals do NOT immediately fall to Earth because ______.

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问题 What is the main topic of the passage?
Ice crystals do NOT immediately fall to Earth because ______.
选项 A、they are kept aloft by air currents
B、they combine with other chemicals in the atmosphere
C、most of them evaporate
D、their electrical charges draw them away from the earth
答案A
解析 ice crystals即是water droplets。第1段第4、5行点明题意。
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