试题与答案

制定投资计划时,不仅要考虑可能获得的盈利,而且要考虑可能出现的亏损。某投资人打算

题型:解答题

题目:

制定投资计划时,不仅要考虑可能获得的盈利,而且要考虑可能出现的亏损。某投资人打算投资甲、乙两个项目。根据预测,甲、乙项目可能的最大盈利率分别为100﹪和50﹪,可能的最大亏损分别为30﹪和10﹪。投资人计划投资金额不超过10万元,要求确保可能的资金亏损不超过1.8万元。问投资人对甲、乙两个项目各投资多少万元,才能使可能的盈利最大?

答案:

解:设投资人对甲、乙两个项目各投资 x,y万元,盈利额为P万元,

目标函数p=x+0.5y,

解得,当x=4,y=6时,P最大;

所以,投资人对甲、乙各投资4万元和6万元时盈利最大。

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题型:阅读理解

阅读理解。

     All the cities are quite the same. Living in a modern Australian city is not very different from living in an

American city. But there are some differences on farms.

     In many parts of the world, farmers and their families live in villages or towns. In the United States, each

farm family lives in its own fields. Usually their neighbors live far away. It's hard for them to see each other

on weekdays. Their children take school buses to the nearest schools. These schools are only for the farm

families in this area (地区). In some areas,there are small schools for a few farm families, and the children

walk to schools.

     Life keeps changing for everyone. So do farmers. Today there are cars, good roads, radios, television

sets and there are modern machines for farming. All of these are changing farm life.

1. Living in a modern Australian city is almost (差不多) _____ living in an American city.

A. different from

B. comfortable like

C. the same as

D. the same

2. Usually farm families live in _____.

A. big cities

B. the country

C. every town

D. the world

3. The farmers in _____ can visit each other easily on weekdays.

A. the world

B. Australia

C. the United States

D. China

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题型:单项选择题

为了能当上副乡长,陕西某乡干部林兴军,伙同其岳父王世全、县乡两级人大代表李宗德,采取贿赂手段拉选票。根据群众举报,地方检察院侦破了这起破坏选举的窝案犯罪嫌疑人林兴军依法刑事拘留,同案犯嫌疑人王世全、李德宗被取保候审。这说明()。

A.任何国家都是民主和专政的统一

B.对敌专政可以保障人民民主

C.民主是专政的基础,专政是民主的保障

D.作为两种国家制度,民主与专政是不同的

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