第一节单项填空（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. ---What can I do for you?
---I’d like to borrow book about Pacific Ocean.
A. the; 不填 B. a; the C. 不填; the D. a; 不填
22. A number of books in the library ____ been stolen so that the number of them ____ smaller than before.
A. have, is B. has, is C. has, are D. have, are
23. --- A good book is a good friend. You can get the help you need from it.
---___________.
A. Exactly B. fluently C. Gradually D. frequently
24. The prize will go to the writer ______ story shows the most imagination.
A．that B．which C．whose D．what
