4．如图，将Rt⊿ABC绕点A逆时针方向旋转90º，则旋转后B点的坐标是　　　　　　　 。　

3．　　　　　　　 　；若点在反比例函数的图象上，则k=　　　　　　 ；36º的补角为　　　　　　　　　 　

2．Sin60⁰=　　　　　　 ；分解因式：7x²-63=　　　　　　　　　　 　；人体中约有2.5×10²³个红细胞，则2.5×10²³中有　　　　　　　　 个有效数字。

1．|-3|=　　　　　 　　　；的相反数为　　　　　　　 ；-3⁰=　　　　　　　　 　；

30. I was not angry at all _________ he had done.

A. that　　 B. which　　 C. what　　 D. those

Keys:

1-5. BCBDC 　　6-10. ACDBA 　　11-15. CDDAC 　　16-20. CBBAB

21-25. BDAAB　　　 26-30. ACBBA

29. He must catch the horse. He knew _______ man than he had tried.

A. well　　 B. better　　 C. it better　　 D. best

28. The working hours will be changes from 8 to 12 _______ 7 to 11.

instead of　　 B. to　　 C. from　　 D. and from

27. In their country the king has __________ powers while the government are in charge of most affairs.

A. his　　 B. limit　　 C. limited　　 D. limited his

26. There is a police car in front of the house of our neighbor's. ________ do you think __________

A. What; has happened　　　　　 B. What; of happening

　　 C. What; of being happened　　　 D. Whatever; of happening

25.The two cities referred ________ London and Paris.

A. to is　　 B. to are　　 C. to be　　 D. are