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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