WeneedtreesbecausetheyCO2,andletoffO2.A.takeoffB.takeinC.takeoffD.takeaway

Question

We need trees because they_____CO2,and let off O2.A.take off B.take in C.take off D.take away

Answer 1

A 和C有区别么= =
我觉得选B
take in
有“吸收”之意,例如
On weekends the Smiths usually drive to the countryside and take in the fresh air there.
周末,史密斯一家常驱车到农村去吸收那里的新鲜空气.