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3.At night,plants _________carbon dioxide and at the same time _________oxygen.So,we may put some in our bedrooms to purify the air.(  )
A.take in,give outB.take up,give off
C.take in,give inD.take off,give up

分析 晚上植物吸入二氧化碳同時釋放出氧氣,因此我們可以放一些(植物)在我們的臥室凈化空氣.

解答 答案:A
解析:A吸入/攝入;釋放 B占據;釋放;C吸入/攝入;投降/上交 D脫下;放棄.根據句意"吸入二氧化碳放出氧氣"可知本題答案為A選項,其余選項均不符合題意.

點評 本題考查動詞短語.做此類題目時一定要熟悉每個動詞短語的含義并結合用法與其在句中的成分來選擇合適的形式.

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