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

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

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问题 What effect does excessive positive ions have on some people?
A high negative inn 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 rotation water sprinkler
答案D
解析 文章第三段第二句谈到负离子多的地方是离水近的地方，比如海边，瀑布和喷泉边，以及有水花喷溅或有喷雾形成的地方。由此可以推断水流速度快容易产生负离子，所以选D，同时也可排除其他选项。
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大学英语四级

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