以社区为基础的病例-对照研究所选病例的优点是（）。 A.病例代表性好 B.混杂偏倚小

计算：

（-8）×（-7）；

12×（-5）；

（-36）×（-1）；

（-25）×16。

对话填空（共10小题，每小题1分，满分10分）

Jack-J; Laura-L

J: I’d like to mail this box to Hong Kong. How much will it be, please?

L: Do you want to send it first class or second class?

J: How much is first class and how (76)l      does it take?                               小题1:  

L: It’s a light box. First class would cost $ 8.20. I(77)g     it                                  小题2:    

will take about eight to ten days to arrive.

J: And second class?

L: Sending it second class would be (78) c      ,                                             小题3:    

but it wouldn’t arrive (79)u     about a month from now. You’ll pay $ 4.90 only.小题4: 

J: Oh, I want it to arrive (80)e     than that. I’ll mail it first class.                           小题5:    

L: What’s in the box? I need to know in order to(81) c      the form.               小题6:    

J:A(82)s       of glasses.                                            小题7:   

Are there any other forms I need to fill out because it’s going to a foreign country?

L: Yes , one more. You have to write clearly what is in the box and the (83) v      小题8:

J: Here it is.

L: You forgot to put a return address on this box. It’s not a post office rule,

but we usually (84)a   people that all mail have a proper return address.                小题9:

J: OK. I’ll do it right now. I’ll also buy ten 60-cent stamps.

L: Let’s see. The box and the stamps. Your (85)t      bill comes to $ 14.20.       小题10:  

J: Thank you.

独活寄生汤的功效不包括

A．祛风湿

B．止痹痛

C．益肝肾

D．补气血

E．通血脉

（）

A.

B.

C.

D.

高处作业人员体格检查周期为多少？哪些人员不得从事高处作业？