问题 单项选择题

操作简便、灵敏度高、检测快速的HCG方法是()

A.电化学发光法

B.放射免疫试验

C.单克隆胶体金法

D.酶联免疫吸附法

E.胶乳凝集抑制试验

答案

参考答案:C

解析:胶体金性质稳定,并能呈色;胶体金与单克隆抗体结合稳定性好,可定性和半定量测定,判断结果准确,灵敏度高,检测便捷,特异性强。

单项选择题
阅读理解

     Arabs consider it extremely bad manners to start talking business immediately. Even the busiest

government official always takes extra(额外的)time to be polite and  offer refreshments. No matter

how busy you are, you should make time for this.

     The conference visit is a way of doing business throughout the Arab world. Frequently, you will have

to discuss your business in the presence of strangers, who may or may not have anything to do with

your business. Do not be surprised if your meeting is interrupted several times by people who come into

the room unannounced, whisper, or speak softly to the person with whom you are talking, and leave.

     Making decisions quickly is not an Arab custom. There is vagueness in doing business in the Middle

East which will puzzle a new-comer. Give yourself lots of time and ask them lots of questions.

     When an Arab says "yes", he may mean "maybe". When he says "maybe", he probably means "no".

You will seldom get a direct “no” from an Arab because it is considered impolite. Instead of  "no", he

will say "inshallah", which means "if God is willing." On the other hand, "yes" does not necessarily mean

"yes". A smile and a slow nod might seem like an agreement, but in fact, your host is being polite. An

Arab thinks that it is impolite to disagree with a guest.

1. The main purpose of this article is to explain ______.

A. why you need extra time when you visit Arab countries

B. how to be polite when doing business in the Arab world

C. why Arab officials are so busy

D. what Arabs say when doing business

2. From this article we know that ______.

A. when an Arab wants to say "yes", he often says "maybe"

B. an Arab seldom disagrees with a guest to his face

C. when an Arab agrees, a smile and a slow nod will be given

D. "inshallah" is an English word

3. Which of the following is NOT an Arab custom?

A. To dislike being interrupted during their meeting.

B. Often to give you a vague answer.  

C. Seldom to say "no" directly.

D. Seldom to hesitate to start talking business in the presence of strangers.