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 over, give in | D.take off, give up |
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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 over, give in | D.take off, give up |