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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

試題詳情

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

試題詳情

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

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

試題詳情

第一節  單項填空(共15小題,每小題1分,滿分15分)

從A、B、C、D四個選項中,選出可以填入空白處的最佳選項,并在答題卡上將該項涂黑。

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  

試題詳情

22.已知R,函數(x∈R).

(Ⅰ)當時,求函數的單調遞增區間;

(Ⅱ)函數是否在R上單調遞減,若是,求出的取值范圍;若不是,請說明理由;

(Ⅲ)若函數上單調遞增,求的取值范圍.

試題詳情

21.某工廠日生產某種產品最多不超過30件,且在生產過程中次品率與日產量()件間的關系為 ,每生產一件正品盈利2900元,每出現一件次品虧損1100元.

(Ⅰ)將日利潤(元)表示為日產量(件)的函數;

(Ⅱ)該廠的日產量為多少件時,日利潤最大?

()

試題詳情

20.若對滿足的任意實數,使得不等式恒成立,

求實數的取值范圍.

試題詳情

19.已知a為實數,函數

(1)若,求函數在定義域上的極大值和極小值;

(2)若函數的圖象上有與x軸平行的切線,求a的取值范圍。

試題詳情


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