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

A. serious B. more serious

C. most serious D. the most serious

【答案】

【解析】B

試題分析:句意:空氣污染已經(jīng)變得比以前更加嚴重。我們必須做些事情來阻止它。than用于比較級的句子中,形容詞應(yīng)該用比較級的形式,serious的比較級為more serious,故答案為B。

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