【題目】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：人類呼吸氧氣是必要的，植物也能產(chǎn)生氧氣。A. develop發(fā)展；B. produce制造，產(chǎn)生；C. improve 改善，提高；D. introduce介紹。植物能產(chǎn)生氧氣，故答案為B。

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