What effect does excessive positive ionization have on some people? A high negative ion count is likely to be found ______.

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问题 What effect does excessive positive ionization have on some people?
A high negative ion count is likely to be found ______.

选项 A、near a pond with a water pump
B、close to a slow-flowing river
C、high in some barren mountains
D、by a rotating water sprinkler

答案C

解析 这道题所参照的文中关键词是spray,可由此进行引申。
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