第二部分：英语知识运用(共两节，满分35分)
第二节：语法和词汇(共15小题：每小题1分，满分15分)
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21. —In recent years, problem of global warming has been very serious.
—That’s right. People are facing number of natural disasters now.
A. /; a B. a ; the C. the ; a D. a ; a
22. —Did you have a good time in holiday?
—Certainly I did. , I have never spent such an interesting one before.
A. As a matter of fact B. As a result
C. As usual D. As if
