树吸收二氧化碳放出氧气。(take in)

Trees________ ________carbon dioxide and give out oxygen.

Some plants cantake in carbon dioxide（二氧化碳）we breathe out and give ________ oxygen tous.

1. A.
   in case
2. B.
   in turn
3. C.
   in return
4. D.
   inaddition

Some plants can take in carbon dioxide(二氧化碳)we breathe out and give ________ oxygen to us.

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短语翻译

太多的二氧化碳________ 　　     　　      　　  

短语翻译

太多的二氧化碳________