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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(jié)  單項(xiàng)填空(共15小題,每小題1分,滿分15分)

從A、B、C、D四個(gè)選項(xiàng)中,選出可以填入空白處的最佳選項(xiàng),并在答題卡上將該項(xiàng)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(shù)(x∈R).

(Ⅰ)當(dāng)時(shí),求函數(shù)的單調(diào)遞增區(qū)間;

(Ⅱ)函數(shù)是否在R上單調(diào)遞減,若是,求出的取值范圍;若不是,請(qǐng)說(shuō)明理由;

(Ⅲ)若函數(shù)上單調(diào)遞增,求的取值范圍.

試題詳情

21.某工廠日生產(chǎn)某種產(chǎn)品最多不超過(guò)30件,且在生產(chǎn)過(guò)程中次品率與日產(chǎn)量()件間的關(guān)系為 ,每生產(chǎn)一件正品盈利2900元,每出現(xiàn)一件次品虧損1100元.

(Ⅰ)將日利潤(rùn)(元)表示為日產(chǎn)量(件)的函數(shù);

(Ⅱ)該廠的日產(chǎn)量為多少件時(shí),日利潤(rùn)最大?

()

試題詳情

20.若對(duì)滿足的任意實(shí)數(shù),使得不等式恒成立,

求實(shí)數(shù)的取值范圍.

試題詳情

19.已知a為實(shí)數(shù),函數(shù)

(1)若,求函數(shù)在定義域上的極大值和極小值;

(2)若函數(shù)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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