问题 单项选择题

拮抗参数(pA2)的定义是

A.使激动药效应增加一倍时的拮抗药浓度的负对数

B.使激动药效应减弱至零时的拮抗药浓度的负对数

C.使加倍浓度的激动药仍保持原有效应强度的拮抗药浓度的负对数

D.使激动药效应减弱一半时的拮抗药浓度的负对数

E.使加倍浓度的拮抗药仍保持原有效应强度的激动药浓度的负对数

答案

参考答案:C

阅读理解

阅读理解。

     A man with a green bag walked into a doctor's room. "Please sit down. Open your mouth and put out

your tongue," the doctor said. "Ok. You can close your mouth now. It is clear something is wrong with

you. You have to do more exercise." "But, doctor", the man said. "I don't think…" "Don't tell me what you

think," the doctor said." I am the doctor, not you. I know what you need. I see hundreds of people like you.

None of them get any exercise. They sit in offices all day and in front of the TV in the evening. What you

need is to walk quickly for at least 30 minutes a day." "Doctor, you don't understand," the man said. "I…."

"I don't want to hear any excuses," the doctor said. "You must find it time for exercise. If you don't, you

will get fat and have health problems when you are older." "But I walk every day" the man said. "oh, yes,

and I know what kind of walking that is. You walk a few meters to the train station from your house, a few

more meters from the station to your office, and a few more meters from your office to a restaurant for

lunch and back." "Please listen to me," the man shouted, getting angry." I am a mailman," the man continued.

"I walk for seven hours every day and I come to send letters." For a moment, the doctor said nothing, and

then he said slowly, "Put out your tongue again, will you?"

1. What's the color of the man's bag? [ ]

A. Black

B. Green

C. Blue

D. Yellow

2. What did the doctor ask the man first to do when he came in? [ ]

A. To put down his bag

B. To sit down

C. To open his mouth

D. To close his mouth

3. The doctor thought           . [ ]

A. the man was too fat and too old

B. the man was lazy and ate too much

C. there was nothing wrong with the man

D. most of his patients needed enough exercise

4. The mailman sends letters            every day.[ ]

A. on foot

B. by bike

C. by car

D. by bus

5. Which of the following is true? [ ]

A. The doctor do exercise every day

B. The man walked a long way to the station

C. The man got angry with the doctor

D. The doctor gave the mailman some medicine

选择题