题目内容

5．光污染对人类健康有害．
Light pollutionis bad for human's  health．

分析 is bad for．

解答 答案：is  bad for．这里是在表达客观事实用一般现在时，表示对…有害用be bad for…，动名词短语做主语谓语动词用单数，故is，故答案是is bad for．

点评 动名词短语做主语在语法意义上来说讲的是一件事或者一个过程，因此被看作单数主语．如：
Swimming in such a river is dangerous．

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