问答题Directions: You are to write in no less than 120 words on the topic “Harmfulness of Fake 　　Commodities”. Your composition should be based on the Chinese clues given below. 　　Outlines: 　　1. 如果有机会到国外度假两周，你会选择哪个国家？ 　　2. 请至少给出三个理由！

问答题Powering the great ongoing changes of our time is the rise of human creativity as the defining feature of economic life. Creativity has come to be valued because new technologies, new industries and new wealth flow from it. And as a result, our lives and society have begun to echo with creative ideas. It is our commitment to creativity in its varied dimensions that forms the underlying spirit of our age. Creativity is essential to the way we live and work today, and in many senses always has been. The big advances in standard of living — not to mention the big competitive advantages in the marketplace — always have come from "better recipes, not just more cooking". One might argue that"s not strictly true. One might point out, for instance, that during the long period from the early days on the Industrial Revolution to modern times, much of the growth in productivity and material wealth in the industrial nations came not just from creative inventions like the steam engine, but from the widespread application of "cooking in quantity" business methods like massive division of labor, concentration of assets, vertical integration and economies of scale. But those methods themselves were creative developments.

问答题It is known that text message(手机短信)has both advantages and disadvantages. Some people think it is a blessing, while others regard it as a hell. In this section, you are asked to write an essay on text message. You can take either stand and provide specific reasons and examples to support your idea. You should write at least 150 words on ANSWER SHEET.

[2012年1月]如下图，三个边长为1的正方形所覆盖区域(实线所围)的面积为()。

[2015年12月]某学生要在4门不同的课程中选修2门课程，这4门课程中的2门各开设一个班，另外2门各开设2个班。该学生不同的选课方式共有( )。

设z(x，y)=(1一y2)f(y一2x)，且已知f"(y)=f(0)=1，则∫02z(1，y)dy=________．

[2014年12月]圆x 2 +y 2 ≤2(x+y)被直线l分成面积相等的两部分。 (1)l：x+y—2； (2)l：2x—y=1。

[2011年1月]某施工队承担了开凿一条长为2 400米隧道的工程，在掘进了400米后，由于改进了施工工艺，每天比原计划多掘进2米，最后提前50天完成施工任务，原计划施工工期是( )。

若f(x)=在(一∞，+∞)上连续，则a=________

[2015年12月]某商场将每台进价为2 000元的冰箱以2 400元销售时，每天销售8台，调研表明这种冰箱的售价每降低50元，每天就能多销售4台。若要每天销售利润最大．则该冰箱的定价应为( )。

设f"(x)=(x一1)(2x+1)，x∈(一∞，+∞)，则在区间(，1)内有()．

设f(x，y)=x 3 一4x 2 +2xy—y 2 ，则下列结论正确的是( )．

设[x]为取整函数，则函数f(x)=x一[x]在(一∞，+∞)上为( )．

[2013年1月]已知{a n }为等差数列，若a 2 和a 10 是方程x 2 —10x一9=0的两个根，则a 5 +a 7 =( )。

[2015年12月]已知某公司男员工的平均年龄和女员工的平均年龄。则能确定该公司员工的平均年龄。 (1)已知该公司员工的人数： (2)已知该公司男、女员工的人数之比。

[2010年1月]某商品的成本为240元，若按该商品标价的8折出售，利润率是15％。则该商品的标价为( )。

设函数求zx"|(0,1)和zy"|(0,1)

[2012年10月]设a、b为实数，则a=1，b=4。(1)曲线y=ax2+bx+1与x轴的两个交点的距离为；(2)曲线y=ax2+bx+1关于直线x+2=0对称。

[2011年10月]如下图，在直角坐标系xOy中，矩形OABC的顶点B的坐标是(6，4)，则直线l将矩形OABC分成了面积相等的两部分。(1)l：x—y—1=0；(2)l：x—3y+3=0。