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，并在答题卡上将该项涂黑。
21. The doorbell _______ for more than five minutes, but there’s no answer.
A. was ringing B. rang
C. had been ringing D. has been ringing
22．Most of us arrange our bedrooms based on personal .
A．similarity B．preference C．excitement D．equipment
23. As a result of destroying the forests, a large _____ of desert _______ covered the land.
A. number, has B. quantity, has C. number, have D. quantity, have
24. When first ____ to the market, these products enjoyed great success.
