26. Many animals sleep a lot when young, but sleep much less when they get older, just　 is the case with human beings.

A? asB? whichC? thatD? it

25. - Do you mean to play the hero in the play?

- . But it should be a character I like.

A? Not surprisinglyB? Not necessarily

C? Not importantlyD? Not absolutely

24. - Mr. Parker is so ambitious. He is seeking any opportunity to get promoted.

- That?s understandable.　 you are in our company determines how well you are paid and　 you can do with you life.

A? Who; thatB? How; whatC? What; thatD? Where; what

23. - Hi, Jane. Are you free at six this evening? I was wondering if you could come with me to see the movie “X?men.”

- I?m sorry but I　 it already. Besides, I　 my mother do the laundry.

A? had seen; would be helpingB? saw; will help

C? have seen; would helpD? have seen; will be helping

22. At the Copenhagen conference, all the countries were called on to do all they could to control greenhouse gas emissions　 it was too late.

A? whenB? afterC? untilD? before

23.(本小题满分10分)选修4-4:坐标系与参数方程

在平面直角坐标系xOy中，已知曲线，将上的所有点的横坐标、纵坐标分别伸长为原来的、2倍后得到曲线. 以平面直角坐标系xOy的原点O为极点，x轴的正半轴为极轴，取相同的单位长度建立极坐标系，已知直线.

(Ⅰ)试写出直线的直角坐标方程和曲线的参数方程；

(Ⅱ)在曲线上求一点P，使点P到直线的距离最大，并求出此最大值.

24(本小题满分10分)选修4-5:不等式选讲

(Ⅰ)已知都是正实数，求证：；

(Ⅱ)已知都是正实数，求证：.　　　　　　　　　

(

银川二中2010届高三高考模拟卷(二)

21. (本小题满分12分)设函数.

(Ⅰ)求函数f (x)在点(0, f (0))处的切线方程；

(Ⅱ)求f (x)的极小值；

(Ⅲ)若对所有的，都有成立，求实数a的取值范围.

请考生在第(22)、(23)、(24)三题中任选一题作答，如果多做，则按所做的第一题记分．

22(本小题满分10分)选修4-1:几何证明选讲

如图所示，AB是⊙O的直径，

G为AB延长线上的一点，GCD是⊙O的割线，过点(

G作AB的垂线，交AC的延长线于点E，交AD的延

长线于点F，过G作⊙O的切线，切点为H .

求证：(Ⅰ)C，D，F，E四点共圆；

(Ⅱ)GH²=GE·GF.