第一节：单项填空（共15小题：每小题1分，满分15 分）
21.---Do you mind if I smoke here?
---_______.I’ve got a bit of cold these days.
A. I’m afraid I do B. Of course not C. No trouble at all D. Yes, just go ahead
22.Song Zhiyong, an ordinary farmer in Tangshang, devoted himself ______the people
in the snow-hit and earthquake-hit areas.
A .to help B. in helping C . to helping D. helping
