A-A+
What effect does excessive positive ions have
问题详情
What effect does excessive positive ions have on some people？
A．They think they are mad.
B．They feel very tired.
C．They become violently sick.
D．They are too tired to do-anything.请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：B
解析：细节题。题于中的excessive对应的是第二段首句中的alargenumberof“过多的，大量的”，而B中的verytired与此句中的fatigue“疲劳”相对应，所以应选B。
