【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】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。serious 的比較級是more serious。結(jié)合語境,故選B。

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