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4. The increasing number of cars on the road _______ traffic. This was the reason why we couldn’t get here on time.

  A. choked back           B. choked down

  C. choked out              D. choked up with

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3. (2012·威海高二检测)—How did the interview go?

—Quite well. Not so smoothly as I expected, _______.

A. instead                 B. either

C. though                 D. as well

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2. No one can understand _______ a decision until it is too late to do so.

  A. him to postpone to make

  B. him to postpone making

  C. his postponing to make

  D. his postponing making

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Ⅰ.单项填空

1. (2012·武汉高二检测) As a teacher rich in experience, he knows how to _______ his ideas to these new students in a limited period of time.

  A. convey                 B. educate

  C. conclude                D. convince

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22.(本小题满分14分)

设数列的前项和为,,且.

(Ⅰ)求数列的通项公式;

(Ⅱ)等差数列的各项均为正数,其前项和为,且

成等比数列,求;

  (III)求数列的前项和.

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20.(本小题满分12分)

已知公差大于零的等差数列,前项和为.且满足.

(Ⅰ)求数列的通项公式;

(Ⅱ)若的最大值.

21.(本小题满分12分)

某水库堤坝因年久失修,发生了渗水现象,当发现时已有m2的坝面渗水.经测算知渗水现象正在以每天m2的速度扩散.当地政府积极组织工人进行抢修.已知每个工人平均每天可抢修渗水面积m2,每人每天所消耗的维修材料费元,劳务费元,给每人发放元的服装补贴,每渗水m2的损失为元.现在共派去名工人,抢修完成共用天.

(Ⅰ)写出关于的函数关系式;

(Ⅱ)要使总损失最小,应派去多少名工人去抢修(总损失=渗水损失+政府支出).

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19.(本小题满分12分)

   在公差为的等差数列中, 为其前项和,对于任意的,都有,若,求的取值范围.

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18.(本小题满分12分)

  在中,已知.

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三、解答题:本大题共6小题,共74分.解答应写出文字说明、证明过程或演算步骤.

17.(本小题满分12分)

解关于的不等式:.

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16. 在下列函数中: ① ;②;③

;⑤其中;⑥.其中最小值为2的函数是           (填入序号).

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