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24. -May I remind you that a Mr Li is waiting outside, sir? 

-Oh, that is right ,  I ____ about it.

A. forget      B. had forgotten   C. forgot      D. have forgotten

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23. --- Do you know when Vicky came back yesterday evening?

   --- Yes. It was not yet nine o’clock   she came back home.

 A.before     B.when     C.that        D.until

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22.Susan was expecting her favorite singers, but to her disappointment ,     appeared.

  A. some     B. everyone     C. none      D. no one

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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. When the spaceship traveled above, ____new-looking earth appeared before us,

____earth that we had never seen before.

A. a; the     B. a; an      C. the; an      D. / ;the  

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22.已知R,函数(x∈R).

(Ⅰ)当时,求函数的单调递增区间;

(Ⅱ)函数是否在R上单调递减,若是,求出的取值范围;若不是,请说明理由;

(Ⅲ)若函数上单调递增,求的取值范围.

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21.某工厂日生产某种产品最多不超过30件,且在生产过程中次品率与日产量()件间的关系为 ,每生产一件正品盈利2900元,每出现一件次品亏损1100元.

(Ⅰ)将日利润(元)表示为日产量(件)的函数;

(Ⅱ)该厂的日产量为多少件时,日利润最大?

()

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20.若对满足的任意实数,使得不等式恒成立,

求实数的取值范围.

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19.已知a为实数,函数

(1)若,求函数在定义域上的极大值和极小值;

(2)若函数的图象上有与x轴平行的切线,求a的取值范围。

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