17. She _______ Japanese when she was in Japan. Now she can speak it freely.

　　 A. picked out　 B. brought about　 C. worked out　 D. picked up

16. ______I shouted at the top of my voice_____ turn around.

A. Not until, did he　　　　　　　　　 B. Not until, he did　

C. Until, did he not　　　　　　　　　 D. Until, he didn’t

15. This computer is _______________ .

A. twice as expensive as that one　　　　 B. twice expensive than that one

C. as twice expensive as that one　　　　 D. two times as expensive as that one

14. He told me that he _______ to the museum ______ .

A. had gone, three days ago　　　　　　 B. were going , the next day

C. had gone, for three days　　　　　　 D. would go, tomorrow

13. ---Do you go to swim every day?

---No, but I ________.

A. used to do　 　　B. used　　 　　　　　 C. used to do it so　　 　 D. used to

12. The problem just ______to be discussed.

A. referred is 　　　　 B. referred to be　　　　　　 C. referring to is　　　　　　 D. referred to is

11. Since the able person, John, is in ______ charge of the matter, we’re sure that the matter is under _____ control now.

A. the; the　　　 　B. the; /　　　　 　　C. /; the　　　　　 D. /; /

26．如图，已知抛物线与轴交于两点，在的左侧，坐标为 与轴交于点 的面积为6.

(1)求抛物线的解析式；

(2)抛物线的对称轴与直线相交于点点为轴上一点，当以为顶点的三角形与相似时，请你求出的长度；

(3)设抛物线的顶点为在线段上方的抛物线上是否存在点 使得是等腰三角形？若存在，求出符合条件的点的坐标；若不存在，请说明理由.

重庆南开中学初2010级2009-2010学年

25．如图，把一张长10cm，宽8cm的矩形硬纸板的四周各剪去一个同样大小的正方形，再折合成一个无盖的长方体盒子(纸板的厚度忽略不计).

(1)要使长方体盒子的底面积为

那么剪去的正方形的边长为多少？

(2)你感到折合而成的长方体盒子的侧面

积会不会有更大的情况？如果有，请你求

出最大值和此时剪去的正方形的边长；如

果没有，请你说明理由；

(3)如果要折合成一个有盖的长方体盒子，则需要把矩形硬纸板的四周分别剪去4个同样大小的正方形以及2个同样形状、同样大小的矩形，请求出侧面积的最大值和此时剪去的正方形的边长.