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Green plants breathe_____oxygen in sunlight.

A. in          B. out         C. back         D. for

B


解析:

考查介詞用法。句意:在陽光下,綠色植物釋放出氧氣。此處釋放的意思;breathe out意思“排出氣體”,符合句意。

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      Very useful of important
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