138.Some plants can take in carbon dioxide(二氧化碳) we breathe

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138.Some plants can take in carbon dioxide(二氧化碳) we breathe out and give ______ oxygen to us.
A.in case B.in turn C.in return D.in addition
in turn 反过来
为何不能选B

选C.
句意：一些作物吸收我们呼出的二氧化碳而给我们呼出氧气作为回报.
A.in case 万一；假使
B.in turn 轮流,依次=by turns,in file；转而,反过来（强调“按顺序轮流过来之后又转向”）
C.in return 作为回报；作为…的报酬；作为交换
D.in addition另外,此外
另外,此外（on top of,on the side）
再问： .in turn 反过来（强调“按顺序轮流过来之后又转向”）能就此点给个例句吗，最好来个和in return 作对比的
再答： Teachers are more responsive to you, people treat you better; you have more opportunities to make your way through the world; you make more money; you have more access to things,;and that could, in turn, cause you to improve your life. 老师更喜欢回应你，人们待你更好，你有更多的机会闯出自己的一条路，你赚到更多的钱，你能得到更多的东西，从而使你能改善你的生活。 If you are always helping others, you will be helped in turn when you need help. I just didn't want to take anything If I couldn't offer anything in return. We'd be happy with just one dance. 如果我不能给予回报的话,我不想接受任何东西。如果能跳个舞，我们就很高兴了。 We should try our best to our life to the full in return for the kindness of our parents.

138.Some plants can take in carbon dioxide(二氧化碳) we breathe 1.The plants can ___ carbon dioxide into oxygen. 英语填空辣.The plants can absorb carbon dioxide and give off xoyg why are trees important (参考词语,take in carbon dioxide,oxygen, Carbon dioxide 英语翻译Carbon dioxide is found in some oil and gas fields as as 求翻译：carbon dioxide build-up in the atmosphere, carbon-dioxide complex是什么意思 carbon dioxide是什么意思 Carbon dioxide concentration(ppmv) Carbon Dioxide or Carbon Oxygen 2? 二氧化碳阻止了地球上的热释放到太空中去 The carbon dioxide ___