24.The couple finally bought the house they wanted, for they enough money.
A.had saved B.were saving C.would save D.were to save
23.You look so tired. You have stayed up late again.
A.should B.can C.may D.must
22.- Has Tom already finished his new story?
- I Have no idea. He it last month.
A.had written B.was writing C.would write D.wrote
第一节 单项填空(共15小题;每小题1分,共15分)
从每题所给的A、B、C、D四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。
例:It’s so nice to hear from her again. , we last met more than thirty years ago.
A.What’s more B.That’s to say C.In other words D.Believe it or not
答案是D。
21.To write your report, you may refer to books 19th century Englist literature.
A.from B.in C.about D.at
22.(本小题满分12分)
已知直线所经过的定点恰好是椭圆的一个焦点,且椭圆上的点到点的最大距离为3.
(Ⅰ)求椭圆的标准方程;
(Ⅱ)已知圆,直线.试证明:当点在椭圆上运动时,直线与圆恒相交,并求直线被圆所截得弦长的取值范围.
(Ⅲ)设直线与椭圆交于两点,若直线交轴于点,且,当变化时,求 的值;
21.(本小题满分12分)
已知函数处有两上不同的极值点,设在点处切线为其斜率为;在点利的切线为,其斜率为
(1)若 和的值
(2)若,求的取值范围。
20.(本小题满分12分)
设各项为正的数列的前项和为且满足:
(Ⅰ)求;(Ⅱ)若求证:
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