【題目】To make rivers than before, everybody is supposed to protect them.

A. dirtyB. dirtierC. cleanD. cleaner

【答案】D

【解析】

句意：為了使河流比以前更清潔，每個(gè)人都應(yīng)該保護(hù)它們。A. dirty臟的；B. dirtier更臟的；C. clean干凈的；D. cleaner更干凈的。根據(jù)than判斷，這是一個(gè)比較級(jí)的句子，排除A,C；根據(jù)“everybody is supposed to protect them.”可知，保護(hù)河流的目的是讓它們更清潔干凈，故答案為D。

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