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. The thief, who was put in _______ prison, had _________ feeling of guilt. So he made _________ great progress.
A. 不填; a不填 B. the; a; 不填 C. 不填; the; a D. the; 不填; a
22. When a pencil is partly in a glass of water, it looks as if it ________________.
A. were broken B. breaks C. has broken D. had been broken
23. The number of smokers in China ________increased in recent years, and a number of them _________ the
