问题 单项选择题

学习记忆是脑的高级机能,其神经基础是中枢神经系统的可塑性,包括神经网络、神经环路和突触连接等不同的层次水平,其中突触是最易变的环节,也是神经可塑性的关键部位。突触可塑性的表现形式有两个方面:一是突触传递效能的改变;二是突触结构参数的变化。
这段话主要支持了这样一种论点,即( )

A.突触具有可塑性
B.突触可塑性的表现形式
C.突触是神经可塑性的表现形式
D.学习记忆的神经基础是什么

答案

参考答案:A

解析: 原文第一句提出中枢神经系统具有可塑性,而突触是神经可塑性的关键部位。第二句指明突触可塑性的两个表现形式。B项只概括了第二句的内容,C项不符合原文,D项只概括了第一句的部分内容,只有A项涵盖了全文,故正确答案为A。

问答题
阅读理解

The market investigation is indispensable to sales promotion. They are as closely related as the lips and teeth, so to speak. What you produce is for sale on the market. It would be impossible to succeed in selling a product without first investigating the market.

In the international market, goods on sale coming from different countries and suppliers are always facing keen competition. Under such circumstances, they will try everything possible to familiarize themselves with the market conditions. In making investigations, we ought to get information about what similar items the competitors are offering on the market, what prices they are quoting(报价), what features their products have, who are their regular customers, etc. Then, how can we obtain such information? There are many channels that we can make use of in doing this sort of work. The commercial counselor's offices of our embassies stationed abroad can help us in making market investigations. Nowadays, our import and export corporations send their trade groups abroad every now and then. One of their purposes is to make market surveys on the spot.

Certainly, face-to-face talks with foreign businessmen are also important channels to get market information. The Chinese Export Commodities Fairs and some other fairs of similar nature as well as visits of foreign businessmen provide us with such opportunities. Of course, there are some other ways of making market investigations.

小题1:In making market investigations, one should ______.

A.get enough information concerned

B.advertise his products

C.produce high quality goods

D.none of the above小题2:The word "indispensable" in the first line means ______.

A.impossible

B.necessary

C.advisable

D.available小题3: Which of the following statements is NOT true?

A.The relationship between market investigation and sales promotion is just as that of the lips and

teeth.

B.It is impossible to succeed in selling a product without market investigation.

C.There are various ways of making market investigation.

D.Production goes before market investigation.小题4:All the following are channels to get market information except ________.

A.to have commercial counsellor' s office of our embassies stationed abroad

B.to promote the quality of our own products

C.to send trade groups abroad every now and then

D.to have face-to-face talks with foreign businessmen