想请教一下这道题应该怎么解？答案是C但是我觉得应该是D。。。
In each of the past five years, Barraland’s prison population has increased. Yet, according to official government statistics, for none of those years has there been either an increase in the number of criminal cases brought to trial, or an increase in the rate at which convictions have been obtained. Clearly, therefore, the percentage of people convicted of crimes who are being given prison sentences is on the increase.
Which of the following, if true, most seriously weakens the argument?
A. In Barraland the range of punishments that can be imposed instead of a prison sentence is wide.
B. Over the last ten years, overcrowding in the prisons of Barraland has essentially been eliminated as a result of an ambitious program of prison construction.
C. Ten years ago, Barraland reformed its criminal justice system, imposing longer minimum sentences for those crimes for which a prison sentence had long been mandatory.
D. Barraland has been supervising convicts on parole more closely in recent years, with the result that parole violations have become significantly less frequent.
E. The number of people in Barraland who feel that crime is on the increase is significantly greater now than it was five years ago.作者: overdrivewang 时间: 2012-3-11 17:47
D选项说是被假释的人少了，那还是说明the percentage of people convicted of crimes who are being given prison sentences is on the increase啊，是strengthen了。C是weaken，10年前体制改革，判刑时间更长了，使得近5年的人口增多作者: Gabby308 时间: 2012-3-12 06:45
我的想法是，CD seems very close, but different
C. Ten years ago, Barraland reformed its criminal justice system, imposing longer minimum sentences for those crimes for which a prison sentence had long been mandatory.----解释了为什么监狱人数增加，但是犯罪率没有提高的原因，反驳结论：offer other possibility.
D. Barraland has been supervising convicts on parole more closely in recent years, with the result that parole violations have become significantly less frequent.-----只能说明监狱人数不变，却没有说“为什么增加” 其实这是个shell game的选项，说的是Premise的内容，但是结论却是无关的作者: christinaryt 时间: 2012-3-13 06:57
