第二部分：英语知识运用（共两节，满分45分）
第一节：单项填空（共15小题，每小题1分，满分15分）
从各题所给的ABCD四个选项中，选出可以填入空白处的最佳选项。
21. ---How about camping, just for a change?
--- OK, ______
A. who cares? B. whatever you say.
C. what’s up? D. it’s nice of you.
22.I can’t remember when turning point occurred exactly, but it might be ______ summer morning when I was in New York.
A．不填；a B．a; a C．the; a D．a; the
23. ---You seem to be familiar with Daqing.
---I _______ here for three years. It’s great to be back.
A. have worked B. worked C. had worked D. work
24. _______the phenomenon of "bystander effect" in the Yueyue event, most Chinese strongly believe that there
