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【题目】It’s necessary for human beings to breathe O2 and plants can __________it.

A. develop B. produce C. improve D. introduce

【答案】B

【解析】句意:人类呼吸氧气是必要的,植物也能产生氧气。A. develop发展;B. produce制造,产生C. improve 改善,提高;D. introduce介绍。植物能产生氧气,故答案为B。

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