1、了解不同级别的天体系统，说明地球在太阳系中的位置。

1.36　 1.49　 1.43　 1.41　 1.37　 1.40　 1.30　 1.42　 1.47　 1.39　 1.41　 1.36　 1.40　 1.34　 1.42　 1.42　 1.45　 1.35　 1.42　 1.39　 1.44　 1.42　 1.39　 1.42　 1.42　 1.30　 1.34　 1.42　 1.37　 1.36　 1.37　 1.34　 1.37　 1.37　 1.44　 1.45　 1.32　 1.48　 1.40　 1.45　 1.39　 1.46　 1.39　 1.53　 1.36　 1.48　 1.40　 1.39　 1.38　 1.40　 1.36　 1.45　 1.50　 1.43　 1.38　 1.43　 1.41　 1.48　 1.39　 1.45　 1.37　 1.37　 1.39　 1.45　 1.31　 1.41　 1.44　 1.44　 1.42　 1.47　 1.35　 1.36　 1.39　 1.40　 1.38　 1.35　 1.42　 1.43　 1.42　 1.42　 1.42　 1.40　 1.41　 1.37　 1.46　 1.36　 1.37　 1.27　 1.37　 1.38　 1.42　 1.34　 1.43　 1.42　 1.41　 1.41　 1.44　 1.48　 1.55　 1.37　

(1)画出样本的频率分布直方图；

(2)根据上述结果估计，小于各端点值的数据所占的百分比各约是多少？

15. How I wish it____! If it ___in a few days, the crops would be saved.　

　 A. will rain; rained　 B. would rain; should rain

　 C. should rain; rains　　 D. would rain; had rained

14. It’s about time that you _____to study English.　　

　 A. begin　 B. will begin　 C. have begun　 D. began

13. He acts as if he _______the owner of the house.　

　 A. will be　 B. has been　 C. is　 D. were

12. Tom insisted what he said ____ true and we insisted that he ____ and have a look.　

　 A. be; should go　 B. should be; would go　　 C. was ; go　 D. was ; would go

11. ___the fog, we should have reached the top of the hill.　　

A.　 In spite of　 B. If there were no　 C. But for　 D. Because of

10. ---- Would you have called her up had it been possible?

　 ---Yes, but I ___ busy doing my homework.　　　　

　　 A. was　 B. were　 C. had been　 D. would be

9. --- I have great difficulty working out this problem.　　

　 --- ___ to me, you ____ less difficulty with such problems.

　 A. If you had listened , would have had　 B. If you listened, would have　

　 C. Had you listened, would have　　 　　D. If you listen, will have

8. His illness was too serious; otherwise he______saved.　　　

A.　 could be　 B., couldn’t have been c. could have　 D. could have been