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
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
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
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
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
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x∈R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
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.
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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