【題目】— Trees produce oxygen to fight air pollution.
— Yes. They harmful gases and clean the air.
A.with; take out
B.against; take out
C.against; take in

【答案】C
【解析】句意：——樹釋放氧氣對抗空氣污染�！堑�。它們吸收有害氣體清潔空氣。fight with與……對抗；take in 吸收。故選C。

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