Q30:

Criminologist:  Some legislators advocate mandating a sentence of life in prison for anyone who, having twice served sentences for serious crimes, is subsequently convicted of a third serious crime.  These legislators argue that such a policy would reduce crime dramatically, since it would take people with a proven tendency to commit crimes off the streets permanently.  What this reasoning overlooks, however, is that people old enough to have served two prison sentences for serious crimes rarely commit more than one subsequent crime.  Filling our prisons with such individuals would have exactly the opposite of the desired effect, since it would limit our ability to incarcerate younger criminals, who commit a far greater proportion of serious crimes.

In the argument as a whole, the two boldfaced portions play which of the following roles?

1. The first is a conclusion that the argument as a whole seeks to refute; the second is a claim that has been advanced in support of that conclusion.

2. The first is a conclusion that the argument as a whole seeks to refute; the second is the main conclusion of the argument.

3. The first is the main conclusion of the argument; the second is an objection that has been raised against that conclusion.

4. The first is the main conclusion of the argument; the second is a prediction made on the basis of that conclusion.

5. The first is a generalization about the likely effect of a policy under consideration in the argument; the second points out a group of exceptional cases to which that generalization does not apply.

我选了E虽然一开始选了B  哪位好心人解释一下？~~

E中说a group of exceptional cases ，似乎只有一种case啊

答案是B吧

这道题目我是这样做的，however之前是Criminologist反对的，之后是Criminologist支持的，两个黑体字后面都紧跟since，表示这两部分都是被解释的，应该是结论性或者是陈述性东东。那么只有B是最合适的。当然有时间的话就读一下，其实说的也是这个意思。

E里面的point out a group of  exceptional cases感觉不对，黑体字应该是Criminologist陈述的一个结论，而E把它当成了一个例证。

不知道你是怎么认为的哈：）

point out a group of  exceptional cases是有点奇怪，我今天重新看一次，思路又觉得清晰了。都不知道我那时候在想什么，可能看到old and young就想到特殊情况~

谢谢楼主！