25. -- 　　　　the new bike for me, Mum? You promised.

　 -- Oh, dear, I forgot.

　　 A. Will you buy　　 B. Did you buy　　 C. Have you bought　　 D. Would you buy

24. --The weather isn't good enough for an outing, is it?

　 -- Not in the least. We can't have 　　　　at this time of the year.

　　 A. a nicer day　　 　B. a worse day　　 C. a worst day　 　　　　D. so fine a day

23. The singing competition, originally　　　 　last month, was finally canceled for the lack of financial support.

　　 A. made　　　 　　B. making　　　 　　C. having been made　　 D. to be made

22. -- What's the matter? You seem rather cross.

　 -- I was asked to pay 　　　　this ugly shirt is worth.

　　 　A. twice what　 　　　B. twice that 　　C. twice of what　　 D. twice of that

第一节：单项选择(共l5小题；每小题l分，满分15分)

21. -- Do you think the information you get from the Internet is 　　　　help when you look for a new job?

　 -- Well, it all depends. Anyway, it gives me more of 　　　chance to try.

　　 A. the; the　　　　　 B. a; a　　　　 C. a; the　　　　　　 D. the; a

21．(12分)椭圆 双曲线两渐近线为 过椭圆的右焦点作直线 使 又设与交于点 与两交点自上而下依次为

(1)当与夹角为 双曲线焦距为4时，求椭圆的方程及其离心率；

(2)若 求的最小值.

20．(12分)等比数列单调递增，且满足：

(1)求数列的通项公式；

(2)数列满足：且时，成等比数列，为前项和，

证明：