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问题 单项选择题

If the quantity demand for a product increases from 9 units to 13 units when the price decrease from $12 to $8, the price elasticity of demand is closest to:（）

A. 0.91

B. 1.00

C. 1.10

答案

参考答案：B

解析：

{(13-9)/[(13+9)/2]}1{(8-12)/(8+12)/2]}=0.3636/-0.4=-0.91，价格需求弹性一般为负数，此处忽略其正负号，用弹性的绝对值表示其大小。如果考题中的选项需要区分正负号，则要选择负号的。

单项选择题

Federal tax evasion is a serious crime that places an unfair tax burden on those members of society who pay their fair share. To reduce the incidence of tax evasion, the government needs to prosecute a few high-profile individuals whose cases will receive substantial media attention.
The argument above relies on which of the following assumptions ？（）

A. The tax system is so complicated that even people who try to comply with it may inadvertently not pay some of their taxes.

B. The average citizen will be less likely to evade taxes after he or she sees a high-profile individual prosecuted for tax evasion.

C. Tax revenues collected from high-profile tax evaders will help to alleviate the unfair tax burden on honest citizens.

D. Although it is difficult to secure a conviction on a charge of tax evasion, if the government focuses its efforts on a small number of high-profile individuals, the odds of obtaining a conviction will increase.

E. While there is no universal measure for determining whether a taxation system is "fair" or "unfair," the current system was constructed by Congress to represent the societal priorities and values of the American people.
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选择题

They kept trying, and their efforts finally _______.

A．make it

B．paid off

C．are made it

D．are paid off
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