第一节：单项填空
21. Some researchers are finding that daydreaming may be important to ______ mental health. Daydreaming, they say, is ______ good means of relaxation.
A. the; 不填 B. 不填; the C. 不填; 不填 D. 不填; a
22. ---There is still an hour to go. Could we seat somewhere to have a drink?
--- __________
A. Let’s have a try. B. Sure. C. That’s right. D. No, we couldn’t.
