【題目】Air pollution has become ____than ever before. We must do something to stop it.

A. the more serious B. more serious

C. seriouser D. the most serious

【答案】B

【解析】

試題分析:句意:空氣污染已經(jīng)比以前變得更嚴(yán)重。我們必須做一些事情來阻止它。根據(jù)語境可知用形容詞的比較級(jí)。serious 的比較級(jí)是more serious。結(jié)合語境,故選B。

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