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25. It was after years of hard work that his dream    a lawyer finally    .

    A. of becoming; came true                  B. to become; come true

    C. of becoming; realized                  D. to become; realized

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24. It suddenly    to me that this was something that I should never do, so I

  turned down her request.

    A. happened         B. hit               C. struck           D. occurred

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23. --- Is the food served in the restaurant tasty?

  ---I’m sure that    else in this town can you find a better restaurant.

    A. anywhere         B. nowhere          C. everywhere       D. somewhere

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22.    is known to us all is    the old scientist, for whom life was hard in the

  past, still works very hard in his eighties.

    A. What; what       B. What; that         C. That; what        D. As; that

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21.      helicopter can take off and land straight up or down, and can also stay

  still in    air.

    A. The; an         B. A; the           C. A; 不填         D. The; 不填

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22.(本题满分14分)

定义在R上的单调函数f(x)满足f(3)=log23且对任意x,y∈R都有

f(x+y)=f (x )+ f(y).

(Ⅰ)求证f (x)为奇函数;

(Ⅱ)若,对任意xR恒成立,求实数k的取值范围

  稿   纸 

福州八中2009-2010学年第二学期期末考试

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21.(本题满分12分)

   我市旅游部门开发一种旅游纪念品,每件产品的成本是15元,销售价是20元,月平均销售a(a>0)件. 通过改进工艺,产品的成本不变,质量和技术含金量提高,市场分析的结果表明,如果产品的销售价提高的百分率为x (0<x<1),那么月平均销售量减少的百分率为x2.记改进工艺后,旅游部门销售该纪念品的月平均利润是y(元)

(Ⅰ)写出y与x的函数关系式;

(Ⅱ)改进工艺后,确定该纪念品的销售价,使旅游部门销售该纪念品的月平均利润最大.

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20.(本小题满分12分)

   已知函数

(Ⅰ)求的最小正周期和单调递增区间;

(Ⅱ)求在区间上的最大值和最小值.

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