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）
21. Appointed as _____ ambassador to the UN, he was determined to serve his country _____ heart and soul.
A. /; / B. the; the C. an; the D. the; a
22. The performance will be given next week. You can go to the student union tickets.
A. for B. in C. by D. on
