第二部分 英语知识运用（共两节，满分40分）
第一节 语法和词汇知识（共20小题；每小题1分，满分20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. —Could you explain it to me a second time? I’m afraid I can’t follow you.
—_____
A. Is that clear? B. That’s what I mean.
C. Maybe I can show you with this chart. D. You are very slow indeed.
22.—It is _____ must for us to b uy a flat.
— Yes. But with house prices going up, it is out of _____ question.
A. a; / B. the; / C. the; a D. a; the
23.The teacher, as well as her thirty students, ____ skating on the frozen river this afternoon.
A. is going B. go C. goes D. are going
