Trees fight air pollution．They are natural air conditioners．( )A．shouldB．mustC．needD．can 题目和参考答案——青夏教育精英家教网——

题目内容

20．Trees fight air pollution．They are natural air conditioners．（　　）

A．

should

B．

must

C．

need

D．

can

分析树可以抵御空气污染．它们是天然的空气调节器．

解答答案：D．should应该；must一定，必须；need需要；can能，会；根据They are natural air conditioners．可知树可以抵御空气污染，树对空气污染的抗击只是一种可能性，故本题使用表示可能的单词can，故选D．

点评本题考查情态动词的用法．解答时注意理解句意以及所给选项的意思并作出正确选择．

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