According to the passage, static electricity can be caused by ______. What effect does excessive positive ions have on some peo

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问题 According to the passage, static electricity can be caused by ______.
What effect does excessive positive ions have on some people?

选项 A、They think they are mad.
B、They feel very tired.
C、They become violently sick.
D、They are too tired to do-anything.

答案B

解析 细节题。题于中的excessive对应的是第二段首句中的a large number of“过多的,大量的”,而B中的 very tired与此句中的fatigue“疲劳”相对应,所以应选B。
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