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、如图,己知椭圆的离心率
,左、右焦点分别为,抛物线
的焦点恰好是该椭圆的一个顶点.
(Ⅰ)求椭圆的方程;
(Ⅱ)若斜率为的直线与轴、椭圆顺次交于
三点.求证。
21、设函数f(x)=ax3-2bx2+cx+4d(a、b、c、d∈R)的图象关于原点对称,且x=1时,f(x)取极小值-。
(1)求a、b、c、d的值;
(2) 若x1,x2∈[-1,1]时,求证:|f(x1)-f(x2)|≤;
(3)当x∈[-1,1]时,图象上是否存在两点,使得过此两点的切线互相垂直?试证明你的结论。
20、设函数,若不等式的解集为。
(1)求的值;(2)若函数在上的值域为[1,4],求实数取值范围。
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