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.Professor Li has interest in history, especially in history of Ming Dynasty.
A. an; x B. an; the C. x; the D. x; an
22. The accident happened on such an evening with strong winds by heavy rain.
A. appeared B. happened C. accompanied D. mixed
