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问题 多项选择题

需求弹性包括( )。

A．需求价格弹性

B．需求收入弹性

C．需求交叉弹性

D．需求替代弹性

E．需求组合弹性

答案

参考答案：A,B,C

解析： 需求弹性包括需求价格弹性、需求收入弹性和需求交叉弹性等。

单项选择题

In the following essay, each blank has four choices. Choose the best answer and writedown on the answer sheet.

Microwave communication uses high-frequency (26) waves that travel in straightlines through the air. Because the waves cannot (27) with the curvature of the earth, they can be (28) only over short distance. Thus, microwave is a good (29) for sendingdata between buildings in a city or on a large college campus. For longer distances, the wavesmust be relayed by means of "dishes" or (30) . These can be installed on towers, highbuildings, and mountain tops.

（29）是（）

A.material

B.equipment

C.medium

D.channel
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单项选择题

有关Word排序正确的是：（）

A、可按日期排序

B、可按行排序

C、最多可设置三个排序条件

D、可按笔划数排序
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