-- 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�！钡谝粋�(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。
點(diǎn)評(píng)：動(dòng)詞不定式可以表示補(bǔ)充，做補(bǔ)足語，而動(dòng)名詞卻沒有此用法；而take out 是“取出”，take care是“照顧”。
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