24.When she was awake, she found that she was lying on seemed to be a piece of stone.
A.that B.which C.what D.it
23.--- I did very badly in the exam this time, so I’ve very upset.
--- Cheer up! I did than you, but I remain happy.
A.no better B.better C.no worse D.not worse
22.In the Beijing Olympics, Phelps from the US is person of wonder, person who swam into the Olympic history.
A.the; the B.the; a C.a; the D.a; a
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。
21.--- Please tell Bruce he has won the first prize in the maths contest.
--- He never did so well before.
A.Congratulations! B.Good luck!
C.That’s right. D.What a good surprise!
22.(本小题满分14分)已知f(x)=ax3+bx2+cx+d是定义在R上的函数,其图象交x轴于A,B,C,三点,若点B的坐标为(2,0),且f(x)在[-1,0]和[4,5]上有相同的单调性,在[0,2]和[4,5]上有相反的单调性.
(1)求c的值;高☆考♂资♀源?网 ☆
(2)在函数f(x)的图象上是否存在一点M(x0,y0),使得f(x)在点M处的切线斜率为3b?若存在,求出点M的坐标;若不存在,说明理由;
(3)求|AC|的取值范围.
21.(本小题满分12分) 在平面直角坐标系中,O为坐标原点,已知两点M (1,-3)、N(5,1),若点C满足 =t +(1-t) (t∈R),点C的轨迹与抛物线:y2=4x交于A、B两点。
(1)求证: ⊥ ;
(2)在x轴上是否存在一点P (m,0),使得过点P任作抛物线的一条弦,并以该弦为直径的圆都过原点.若存在,请求出 m的值及圆心的轨迹方程;若不存在,请说明理由.
高☆考♂资♀源?网 ☆
20.(本小题满分12分)已知数列{an}的前n项和S n,且对一切正整数n恒成立.
(1)证明数列{an+3}为等比数列;
(2)数列{an}是否存在三项构成等差数列?若存在,求出一组;若不存在,请说明理由.
高☆考♂资♀源?网 ☆
19.(本小题满分12分) 如图,在四棱维P-ABCD中,底面ABCD为正方形,PD⊥平面ABCD,且PD=AB=a,E是PB的中点.
(1)求异面直线PD与AE所成角的大小;
(2)在平面PAD内求一点F,使得EF⊥平面PBC;
(3)在(2)的条件下,求二面角F-PC-E的大小.
高☆考♂资♀源?网 ☆
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