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问题 单项选择题

弧弹性系数对曲线型需求曲线的点弹性系数的估计在下列哪种情况发生时将得到改善( )。

A．弧长变短时

B．弧的曲率变小时

C．上面二者都发生变化时

D．上述都不变时

答案

参考答案：C

单项选择题

为了改变输出文本中的字型字号，WPS软件是在编辑屏幕上（）

A、直接选择

B、通过命令选择

C、通过模拟显示选择

D、通过设置输出控制符选择
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单项选择题

Visitors to this country are normally admitted for six months, but foreign students can usually stay for one year. They must (51) an educational institution, and they are required to study for a minimum of fifteen hours a week on a (52) course. Prospective students have to show that they can afford their studies, and that they have sufficient (53) resources to support themselves (54) in this country.

In order to work here the foreigner needs a work permit, (55) must be applied for by his prospective employer. The problem here is that the Department of Employment has the right to grant or (56) these permits, and there is little that can be done (57) it; it would be extremely unwise for a foreign visitor to work (58) a permit, since anyone doing so is liable to immediate deportation (驱逐出境). There are some people from the Common Market countries, who are often given (59) residence permits of up to five years. Some other people, such as doctors, foreign journalists, authors and others can work without permits, and foreign students are normally allowed to (60) part-time jobs while they are studying here.

60().

A.engage 

B.take 

C.expect 

D.review
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