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。
例: It is generally considered unwise to give a child he or she wants.
A. however B. whatever C. whichever D. whenever
答案是B
21. We can never expect bluer sky unless we create less polluted world.
A. a; a B. a; the
C. the; a D. the; the
22. – I wonder how much you charge for your services.
-- The first two are free the third costs $30.
A. while B. until
C. when D. before
23. Daniel's family their holiday in Huangshan this time next week.
A. are enjoying B. are to enjoy
C. will enjoy D. will be enjoying
