二、单项填空（共15小题，计15分）

从每小题A、B、C、D中选出一个能填入句中空白处的最佳答案。

21. – Isn’t the girl who talked to you kindly your sister?

–            . She is my English teacher.

  A. Yes, she isn’t    B. No, she is      C. No, she isn’t        D. Yes, she is

22. When and where to go for the holiday __________ yet.

   A. are not decided                  B. have not been decided

   C. is not being decided            D. has not been decided

23. Now day breaks, ________ the birds are singing.

A. because           B. for           C. since              D. as

24. Pandas will __________ if we continue destroying ecosystem (生态系统).

   A. die of       B. die away    C. die from         D. die out

25. The young lady _________ we met yesterday is our new maths teacher.

   A. what          B. whose       C. whom             D. which

26. Of the two skirts, Lucy chose               one.

A. less expensive               B. the least expensive

C. the less expensive          D. the most expensive

27. ---Turn off the light.

   ---      ?

   ---I asked you to turn off the light.

A. Excuse me       B. Sorry        C. Pardon       D. Don’t you