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. Although Zhang Ziyi is _____ international film star, she manages to achieve _____ balance between her career and family.
A. the; a; B. an; a C. 不填；a D. an; 不填
22. The Olympic _____ remind us of where the Olympics are held and the characteristics of the host country.
A. symbols B. signals C. marks D. signs
