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问题 单项选择题

假设某金融资产下一年在经济繁荣时收益率是20%，在经济衰退时收益率将是-20%，在经济状况正常时收益率是10%。以上三种经济情况出现的概率分别是0.3、0.2、0.5。那么，该金融资产下一年的期望收益率为( )。

A．7%
B．12%
C．15%
D．20%

答案

参考答案：A

解析： 根据组合的期望收益率的计算公式，可得：
20%×0.3+(-20%)×0.2+10%×0.5=7%。

阅读理解

根据短文判断正（T）误（F）

What will life be like in 3000? Different people have different answers. Here is my answer.

I think life will be very different in 3000. Every family will have a robot. The robot can do everything for people. So people won’t have to do heavy and dull work. And they will have more free time to enjoy the things they like.

People will wear special clothes in 3000. They don’t have to wash the clothes because the clothes won’t get dirty. There will be more kinds of food for people to enjoy. And they are all healthy food.

People will use energy（能量） from the sun and the wind. So there won’t be any pollution （污染）problems.

People will use a special car to travel. It can run on the road and fly in the air. It will be very easy for people to travel to the moon and other planets（星球）. Some people will live in other planets.

It will be a happy world in 3000.

小题1:Most families will have a robot.

小题2:People won’t eat food in 3000.

小题3:There will no pollution problems in 3000.

小题4:It will be very difficult for people to travel to the moon.

小题5:People will still only live on the earth.

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单项选择题 共用题干题

男，20岁，左大腿下端红肿2月余，表面静脉怒张，皮温升高，X线平片示左股骨下端有边界不清的骨质破坏区，骨膜增生呈放射状阴影

骨肿瘤中最常见的是（）。

A.骨巨细胞瘤

B.骨结核

C.骨囊肿

D.骨转移瘤

E.骨肉瘤
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