Trees take harmful gas from the air, and ______ oxygen (氧气) into the air.

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问题 Trees take harmful gas from the air, and ______ oxygen (氧气) into the air.

选项 A、let out
B、set off
C、give up

答案A

解析 let out释放，set off出发，启程，give up放弃。据题意选A。

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公共英语一级笔试

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