问题 单项选择题

请根据以下资料回答:
某种股票各种可能的投资收益率以及相应的概率如下表所示:

发生概率 投资收益率(%)
0.2 40
0.5 10
0.3 -8

该股票的期望收益率为______。

A.11.5%

B.10.6%

C.11.8%

D.12.6%

答案

参考答案:B

解析: 该股票的期望收益率=0.2×40%+0.5×10%-0.3×8%=10.6%。

阅读理解

第三部分 阅读理解(共20小题;每小题2分,满分40分)

从A、B、C、D四个选项中,选出最佳选项。

A group of graduates,highly established in their careers,got together to visit their old university professor.

The conversation soon turned into complaints about stress in work and in life.offering his guests coffee,the professor went to the kitchen and returned with a large pot of coffee and a variety of cups——plastic,glass,crystal(水晶),some plain—looking,some expensive,some fine——telling them to help themselves to the coffee.

When all the students had a cup of coffee in hand,the professor said:“If you noticed,all the nice—looking,expensive cups were taken up,leaving behind the plain and cheap ones.While it is normal for you to want only the best for yourselves,that is the source of your problems and stress.”

“What all of you really wanted was coffee,not the cup,but you consciously went for the best cups and were eyeing each other’s cups.”

“Now consider this:Life is the coffee and the jabs,money and position in society are the cups.They are just tools to hold and contain life,and do not change the quality of life.Sometimes,by concentrating only on the cup,we fail to enjoy the coffee.So,don’t let the cups drive you...enjoy the coffee instead.”

56.Why did the conversation soon turn into complaints?

A.Because there was no coffee to drink.

B.Because there was nothing to talk about except complaints

C.Because life was not easy for everyone.

D.Because there was nothing better than to complain.

57.The professor brought in a variety of cups because           .

A.he was richer than his students

B.he was fond of collecting cups

C.there were too many people to drink coffee

D.the cups would play an important part in his talk

58.In the author’s opinion          .

A.it is necessary to have a variety of cups to meet the needs of different guests

B.one should concentrate on main things in life

C.the students liked drinking coffee mole than anything else

D.cups are more important than coffee

59.We can infer that       .

A.in our daily life most people want only the best for themselves

B.coffee was as important as a cup

C. a teacher should have a11 kinds of cups at home

D.whether coffee is nice to drink depends on the cup

单项选择题