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A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21.—Could you mail these letters for me please？
— letters？ Your friends are going to be very happy to hear from you again.
A. What B. Some C. More D. Different
22.—Not getting the job was a big letdown.
—Don't worry. Something better will .
A. come along B. take on
C. go by D. fall behind
23.It is known that water is not endless resource，nor that can be made once more.
A. the； 不填 B. an； one C. an； that D. 不填； one
