-- What can trees do _________ us ?
--- They can _________ harmful gases and produce oxygen .


  1. A.
    helping , take in
  2. B.
    to help , take in
  3. C.
    helping , take out
  4. D.
    to help , take care
B
試題分析：根據(jù)題干，本句的意思是“樹(shù)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(dòng)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。
考點(diǎn)：本題考查動(dòng)詞不定式和動(dòng)詞短語(yǔ)
點(diǎn)評(píng)：動(dòng)詞不定式可以表示補(bǔ)充，做補(bǔ)足語(yǔ)，而動(dòng)名詞卻沒(méi)有此用法；而take out 是“取出”，take care是“照顧”。
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