第一節(jié) 單項(xiàng)填空(共15小題;每小題1分,滿分15分)
從每題所給的A、B、C、D四個(gè)選項(xiàng)中,選出可以填入空白處的最佳選項(xiàng),并在答題卡上將該項(xiàng)涂黑。
21. In America, if ________ friend has invited you to drop by anytime, it is ________ best to call before visiting to make sure it is convenient for him.
A. a; a B. the; a C. a; 不填 D. the; 不填
22. Some people would rather ride bikes as bike riding has ________ of the trouble of taking buses.
A. nothing B. none C. some D. neither