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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:1271

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 out B.take up, give off
C.take in, give in D.take off, give up
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Atnight,plantscarbondioxideand