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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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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