25. You’d better cut your hair short. Our school doesn’t _______ long hair.
A. approve of students wearing B. approve students to wear
C. approve students wearing D. approve of students to wear
24. Zhao Benshan, whose overwork _______ his health failure last year, is said to perform in the coming Spring Festival Gala on CCTV.
A. submitted to B. admitted to C. contributed to D. subscribed to
23. - Has Yang Liping returned from Yunnan yet? I’d like to meet her.
- Sorry. She _______ back here only for last weekend.
A. has been B. would be C. had been D. was
22. - Hey, you haven’t been acting like yourself. Everything OK?
-_______.
A. Sure, it is B. I’m fine, thanks C. That’s good D. It’s a pleasure
第一节:单项填空(共15小题;每小题1分,满分15分)
从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。
21. The United Nations set _______ deadline for that country to accept _______ peace plan.
A. the; the B. the; a C. a; the D. a; a
23.[必做题]已知,
,
.
(1)当时,试比较
与
的大小关系;
(2)猜想与
的大小关系,并给出证明.
22.[必做题]如图,已知正方形ABCD和矩形ACEF所在的平面互相垂直,,
.
(1)求直线与平面
所成角的正弦值;
(2)在线段AC上找一点P,使与
所成的角为
,试确定点P的位置.
21.[选做题]在A,B,C,D四小题中只能选做2题,每小题10分,共计20分.请在答题卡指定区域内作答,解答时应写出文字说明、证明过程或演算步骤.
A.选修4-1:几何证明选讲
如图,⊙O是等腰三角形ABC的外接圆,AB=AC,延长BC到点D,使得CD=AC,连结AD交⊙O于点E,连结BE与AC交于点F,求证BE平分∠ABC.
B.选修4-2:矩阵与变换
已知圆在矩阵A=
对应的变换下变为椭圆
,求
的值.
C.选修4-4:坐标系与参数方程
在极坐标系中,圆的极坐标方程为
,以极点为原点,极轴为
轴的正半轴建立平面直角坐标系,直线
的参数方程为
(
为参数),求直线
被圆
所截得的弦长.
D.选修4-5:不等式选讲
若正数a,b,c满足,求
的最小值.
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