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  3. What effect does excessive positive ionization have on some people? People should be able to come to a decision about ions in t

What effect does excessive positive ionization have on some people? People should be able to come to a decision about ions in t

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问题 What effect does excessive positive ionization have on some people?
People should be able to come to a decision about ions in the air if they ______.
选项 A、note their own reactions.
B、move to a healthier area.
C、observe domestic animals.
D、watch how healthy people behave.
答案A
解析
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