2. 外语
  3. This passage is about a______. According to Dr. Scorer, lightning is caused by______.

This passage is about a______. According to Dr. Scorer, lightning is caused by______.

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问题 This passage is about a______.
According to Dr. Scorer, lightning is caused by______.
选项 A、rain falling through clouds
B、hail falling through supercooled clouds
C、hail falling through superheated clouds
D、ice particles falling through any clouds
答案B
解析 本文主要就是介绍Scorer博士关于闪电成因的理论，第一段第二句说得很具体：“Dr Scorer believes the cause is hail falling through supercooled clouds.”
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大学英语六级

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