第二部分：基础知识运用（共两节，满分45分）
第一节：单项选择(共15小题，每小题1分，共计15分)
21..----Oh, you’ve made the noise so loud!
----Sorry,__________.
A. I’m afraid not B. nothing serious C. I didn’t mean it D. it doesn’t matter
22. Why______ you do everything as if you have to win?
A. must B. can C. need D. shall
23. Whether you believe it or not, it was________ caused the serious accident.
A. because of your carelessness that B. because you were careless
C. you were careless that D. your being carelessness that
24. _______ is even important is ______ as the earth cooled down, water began to appear on its surface.
A. That, that B. What, that C. What, what D. It, that
