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
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
22.Susan was expecting her favorite singers, but to her disappointment , appeared.
A. some B. everyone C. none D. no one
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
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)若函数在上单调递增,求的取值范围.
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?
()
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.
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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