【題目】Trees can _________ harmful gases from the air.

A. take in B. put out C. give off

【答案】A

【解析】

句意樹木能吸收空氣中的有害氣體。A. take in吸收;B. put out撲滅;C. give off散發(fā)出。我們知道樹木可以凈化空氣,吸收空氣中的有害氣體。故選A。

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