第二部分：英语知识运用(共两节。满分45分)
第一节：语法和词汇知识(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. She is ______success, _______woman as she is.
A. a ; a B. / ;a C. a ; / D. the ; the
22. Except on official _______such as formal receptions, Americans society has a certain amount of informality.
A. cases B. situations C. conditions D. occasions
23. I _____ often go fishing when I lived in the countryside.
A. should B. would C. could D. might
