题目内容

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时释放出氧气，因此我们可以放一些（植物）在我们的卧室净化空气．

解答 答案：A
解析：A吸入/摄入；释放 B占据；释放；C吸入/摄入；投降/上交 D脱下；放弃．根据句意"吸入二氧化碳放出氧气"可知本题答案为A选项，其余选项均不符合题意．

点评 本题考查动词短语．做此类题目时一定要熟悉每个动词短语的含义并结合用法与其在句中的成分来选择合适的形式．

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