Question

【题目】— 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

Answer 1

【答案】C
【解析】句意：——树释放氧气对抗空气污染。——是的。它们吸收有害气体清洁空气。fight with与……对抗；take in 吸收。故选C。