4．某学生离家去学校,由于怕迟到,所以一开始就跑步,等跑累了再走完余下的路程．在下图中,纵轴表示离学校的距离,横轴表示出发后的时间,则较符合学生走法的是　　 (　　 )

3．函数的最小正周期为　　　　　　　　　　　　　　　　　 (　　 )

A．　　　　　　　　 B．　　　　　 C．　　　 　　　　D．

2．已知集合，，且，则的值为　　　 (　　 )

A．1　　　　　　　　 B．-1 　　　　　C．1或-1　　　　　 D．1或-1或0

1．　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 (　 　)

A．　　　　　 B．　 　　　　 C． 　　　 D．

15. Not until ________ her dark glasses ___________ she was a famous film star.

A. did she take off, I realized　　　 　　　 B. she took off, did I realize

C. did she take off, did I realize　　 　 D. she took off, I realized

14. No sooner ______ home ______ I told him the exciting news.

A. had he got; when　 　　　　　　　　　　　　 　B. had he got; than　

C. he had got; when　 　　　　　　　　　　　 　D. he had got; than

13._____at the news that she did nothing but _____herself in bed.　

A. So sad she looked; laid　　　　　 B. So sad did she look; lay

C. So sadly she looked; to lie 　　 D. So sadly did she look; to lay

12. Only ______ do the job and only in this way _____ do the job well.

A. can you; can you　　　　　　　　 B. you can; can you　

C. you can; you can　　　　　　　　 D. can you; you can

11. She was greatly shocked at the scene before her eyes. Never did she expect that local conditions ____be so awful.

A．could　　　 　　 B．should　　　 　　　 C．would 　　　　　 D．might

10. Only when the villagers were faced with water shortage___ ____ how serious the problem of water pollution was．

A．did they realize　　　　　　　　 B．will they realize　

C．they did realize　　　　　　　　 D．were they realized