问题 单项选择题

在研究某社区饮酒与肝癌关系的队列研究中,饮酒者肝癌的发病率为58.5/10万,不饮酒者肝癌的发病率为12.5/10万,该社区的人群肝癌的发病率为35.5/10万。根据此资料,人群归因危险度为

A.20.0/10万

B.23.0/10万

C.46.0/10万

D.48.0/10万

E.无法计算

答案

参考答案:B

阅读理解

阅读理解。

The rich and the poor

  The world is divided (分为)into two main parts . The difference is that

one part is rich  and the other is poor . In the poor part , a lot of people never get

enough to eat . In the  rich part , a lot of people eat too much . In one part , child

starve (饿死)and in the other ,  a lot of people get fatter and fatter and have to

go on diets (吃特别饮食), or do special  exercises in order to lose weigt.     

  The poorer countries have special problems . Sometimes the land is too

poor to grow  anything on . The land can be improved (改善), but a lot of

things must be done first . The  people must be educated an water must be

found.     

  But rich countries have problems , too . There are not always pleasant

places to live in .  Sometimes the air is too dirty to breathe , and the rivers are

too dirty to swim in or to take  water from . The roads are too crowded to drive

along . Large numbers of people do not have  decent (象样的)housed to live

in . Some things will have to be done about these problems .  The air and the

river will have to be cleaned , and more houses will have to be built.     

Answer the questions :   

1. What’s the difference between the two parts ?     

___________________________  

2. Do the poorer countries have many problems ? What for example ?     

___________________________  

3. Can anything be done about it ?     

___________________________  

4. What must be done, for example ?     

___________________________  

5. Can all this be done easily ?     

___________________________

单项选择题