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        1. -- What can trees do _________ us ?
          --- They can _________ harmful gases and produce oxygen .
          A.helping , take inB.to help , take inC.helping , take outD.to help , take care
          B

          試題分析:根據(jù)題干,本句的意思是“樹能為我們做什么?”“他們能吸收有害氣體,生產(chǎn)氧氣。”第一個(gè)空需要用動詞不定式表示補(bǔ)充,而第二空表示“吸收”應(yīng)該用take in。所以本題選B。
          點(diǎn)評:動詞不定式可以表示補(bǔ)充,做補(bǔ)足語,而動名詞卻沒有此用法;而take out 是“取出”,take care是“照顧”。
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