问题 问答题

需求交叉弹性(cross elasticity of demand)

答案

参考答案:需求交叉弹性(cross elasticity of demand):一种商品的需求量对另一种商品价格变化的反应程度。相关商品价格是决定商品需求量的一个重要因素,相关商品价格的变化会引起商品需求量的变化。需求交叉弹性可表示为需求量变化的百分比对另一种商品价格变化的百分比的比。根据需求交叉弹性,可以把两商品之间的关系分为相关商品和无关(非相关)商品。如果需求交叉弹性非零,则两商品为相关商品;如果需求交叉弹性为零,则两商品为无关商品。在相关商品中,如果需求交叉弹性为正值,则两商品是相互替代的商品或称替代品;如果需求交叉弹性为负值,则两商品是相互补充的商品,或称互补品。

单项选择题

Generally speaking, a British is widely regarded as a quiet, shy and conservative person who is (1) only among those with whom he is acquainted. When a stranger is at present, he often seems nervous, even (2) . You have to take a commuter train any morning or evening to (3) the truth of this.

Serious-looking businessmen and women sit reading their newspapers or dozing in a corner; hardly anybody talks, since to do so would be considered quite (4) .

(5) , there is an unwritten but clearly understood code of behavior which, once broken, makes the offender immediately the object of (6) .

It has been known as a fact that a British has a (7) for the discussion of their weather and that, if given a chance, he will talk about it (8) .

Some people argue that it is because the British weather seldom (9) forecast and hence becomes a source of interest and (10) to everyone.

This may be so. (11) a British cannot have much (12) in the weathermen, who, after promising fine, sunny weather for the following day, are often proved wrong (13) a cloud over the Atlantic brings rainy weather to all districts! The man in the street seems to be as accurate — or as inaccurate — as the weathermen in his (14) .

Foreigners may be surprised at the number of references (15) weather that the British (16) to each other in the course of a single day. Very often conversational greetings are (17) by comments on the weather. “Nice day, isn’t it” “Beautiful!” may well be heard instead of “Good morning, how are you” Although the foreigner may consider this exaggerated and comic, it is (18) .pointing out that it could be used to his advantage. If he wants to start a conversation with a British but is at a loss to know (19) to begin, he could do well to mention the state of the weather. It is a safe subject which will (20) an answer from even the most reserved of the British.

2()

A.reserved

B.urgent

C.embarrassed

D.anxious

单项选择题