5.光污染對(duì)人類健康有害.
Light pollutionis bad for human's  health.

分析 is bad for.

解答 答案:is  bad for.這里是在表達(dá)客觀事實(shí)用一般現(xiàn)在時(shí),表示對(duì)…有害用be bad for…,動(dòng)名詞短語做主語謂語動(dòng)詞用單數(shù),故is,故答案是is bad for.

點(diǎn)評(píng) 動(dòng)名詞短語做主語在語法意義上來說講的是一件事或者一個(gè)過程,因此被看作單數(shù)主語.如:
Swimming in such a river is dangerous.

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