第一部分：英语知识运用（共两节，满分35分）
第一节：单项填空（共15小题；每小题1分，满分15分）
21. Mr. Smith, ________ of the ________ speech, started to read a novel.
A. tired; bored B. tiring, bored C. tired; boring D. tiring; boring
22. Is this the reason ________ at the meeting for his carelessness in his work?
A. why he explained B. what he explained
C. how he explained D. he explained
