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问题 单项选择题

关于需求弹性，下列选项错误的是（）。

A.需求弹性实际上反映的是需求量对价格的敏感程度

B.不同的商品具有不同的弹性

C.替代品越多，越容易获得，需求弹性就越大

D.购买某商品所需支出的比例越大，则需求弹性越小

答案

参考答案：D

解析：购买某种商品所需支出的比例越大，则需求弹性越大。比如，对消费者而言，汽车的需求弹性远大于食盐。

单项选择题

Vessel towing with the current shall（）tow more than two boats and they must be towed alongside.

A.at times

B.at any time

C.at no time

D.at moment
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单项选择题

For each blank, choose the best answer from the four choices and write down on the answer sheet.
(66) is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.
(67) is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.
(68) functions with two layers of protocols. It can connect networks of different speeds and can be adapted to an environment as it expands.
(69) is the popular LAN developed under the direction of the IEEE 802.5.
(70) is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.

A．ISO

B．ANSI

C．CCYIT

D．IEEE
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