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

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
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