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，并在答题卡上将该项涂黑。
21. Obama, ________ president of the USA, won ________ Nobel Prize for Peace in 2009.
A. 不填；a B不填；the C. a；the D. the；a
22. --May I speak to Professor White, please?
--Sorry, he isn’t in. This is his assistant speaking. Can I help you?
A. Oh, you can B. Oh, it’s a pity
C. I hope to see him soon D. I should think so
