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27.---You should apologize to her, Barry.

  ---___________, but it’s not going to be easy.

A.I suppose so      B.I feel so           C.I prefer to       D.I like to

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26.So loudly ________ that everyone of the class could hear him.

A.did he speak       B.did he spoke   C.spoke he        D.he spoke

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25._________ that she didn’t do a good job, I don’t think I am abler than her.

A.to have said       B.Having said    C.To say         D.saying

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24.Our school _________ food ________ the students.

A.provides; with    B.provides; for      C.provides; to      D.provides; at

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23.---Good morning.Can I help you?

  ---I’d like to have this package __________, madam.

A.be weighed        B.to be weighed      C.to weigh          D.weighed

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22.Leave your key with a neighbor __________ you lock yourself out one day.

A.ever since      B.even if          C.soon after      D.in case

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第一节 单项选择(共15小 题;每小题1分,共15分)

21.Mr.Green stood  in defence of the 16-year-old boy, saying that he was not the one

_________.

A.blamed       B.blaming        C.to blame        D.to be blamed

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17.解(1) 

 

解法一:(Ⅰ)因为点P在椭圆C上,所以,a=3.

在Rt△PF1F2中,故椭圆的半焦距c=,

从而b2=a2c2=4,

  所以椭圆C的方程为=1.

(Ⅱ)设AB的坐标分别为(x1,y1)、(x2,y2).

  从而=

=-=………………10分

由上-=

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同步练习册答案