快考试了~~急求PREP-2 两道题 太难了

37.       (32151-!-item-!-188;#058&006653)

The use of radar detectors in commercial vehicles was banned because commercial truck and bus drivers were using these devices to drive faster than the posted speed limit without fear of arrest.  Since drivers of noncommercial vehicles also use radar detectors and since speeding decreases safety for any vehicle, use of radar detectors should also be banned in noncommercial vehicles to increase safety.

Which of the following, if true, most strongly supports the argument above?

(A) The average noncommercial-vehicle driver is involved in less long-distance driving than is the average commercial-vehicle driver.

(B) In many places airplanes or helicopters are used rather than radar to locate vehicles traveling faster than the posted speed limit.

(C) The ban on radar detectors in commercial vehicles has been effective in deterring them from speeding.

(D) Traffic accidents involving a truck or bus generally pose a greater threat of injury or death than do other accidents.

(E) Radar detectors are sometimes set off by devices other than the law enforcement devices that the radar detectors were built to detect.

我现在明白选C  谁能帮我解释一下E 到底是什么意思?

When people evade income taxes by not declaring taxable income, a vicious cycle results.  Tax evasion forces lawmakers to raise income tax rates, which causes the tax burden on nonevading taxpayers to become heavier.  This, in turn, encourages even more taxpayers to evade income taxes by hiding taxable income.

The vicious cycle described above could not result unless which of the following were true?

(A) An increase in tax rates tends to function as an incentive for taxpayers to try to increase their pretax incomes.

(B) Some methods for detecting tax evaders, and thus recovering some tax revenue lost through evasion, bring in more than they cost, but their success rate varies from year to year.

(C) When lawmakers establish income tax rates in order to generate a certain level of revenue, they do not allow adequately for revenue that will be lost through evasion.

(D) No one who routinely hides some taxable income can be induced by a lowering of tax rates to stop hiding such income unless fines for evaders are raised at the same time.

(E) Taxpayers do not differ from each other with respect to the rate of taxation that will cause them to evade taxes.

文章很简单的吧,,  这道题到底在问什么 我看不明白啊.......

答案C我也不明白是什么意思...  请大家指点指点我吧   谢谢了```

３７．E) Radar detectors are sometimes set off by devices other than the law enforcement devices that the radar detectors were built to detect.

大概就是说　雷达探测器有时的用来做其他的装置，而不是作为那种法律实施的装置（用来探测的雷达探测器）

我翻译不太行，包涵一下．这个和原文好象没有直接联系．

５０．(C) When lawmakers establish income tax rates in order to generate a certain level of revenue, they do not allow adequately for revenue that will be lost through evasion.

当制法人员为了获得一定水平收入而建立所得税率，他门不完全允许收入通过隐瞒而失去．所以提高税率不会使更多的人逃税．

不好意思，英语实在不怎么好，不知道怎么用中文表达……

50. 逃税 -〉law maker 收入减少 -> law maker 提高税率 （留出有人逃税的余量）-> 逃税 -> lawmaker 收入减少 -> 不需要再提高税率

allow for 考虑在内