13．Many medical scientists are racing__________time to find a cure for H1N1 as soon as possible.
| A．on | B．against | C．for | D．In |
25. It is only after my father was long gone _____ understand his deep love for me.
| A．I could | B．could I | C．that I could | D．when I could |
24. A growing number of people are beginning to believe that learning new skills and knowledge
_____ more promotion opportunities.
contributes to B. refers to C. devotes to D. appeals to
23. His interests extended _____ the fine arts to international politics and philosophy.
| A．across | B．through | C．over | D．beyond |
22. —Mr. Smith _____ in Russia for 10 years.
—No wonder he can speak Russian fluently and now teaches Russian in a Chinese college.
had stayed B. has stayed C. stayed D. stays
第二部分英语知识运用（共两节，满分35分）
第一节单项填空（共15小题；每小题1分，满分15分）
从每小题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。
21. _____ Chinese basketball player Yao Ming will probably return to the NBA if he can recover from _____ earlier injury.
A. 不填; an B. The; 不填 C. A; an D. The; the