※ 引述《Birou (十里春风不如你)》之铭言：
: Newspaper editorial:
: In an attempt to reduce the crime rate, the governor is getting tough on
: criminals and making prison conditions harsher. Part of this effort has been
: to deny inmates the access they formerly had to college-level courses.
: However, this action is clearly counter to the governor's ultimate goal,
: since after being released from prison, inmates who had taken such courses
: committed far fewer crimes overall than other inmates.
平常做CR时，建议能够练习缩减资讯精炼故事：
为了减少犯罪率，政府打算不让囚犯上课。
但是这会跟目的牴触，因为有上课的出狱后再犯次数较低。
相信原PO对C的答案思路应该没什么问题，做题时应该是A/C在犹豫。
所以这里专门针对A分享一些实战中逻辑要高分必须注意的陷阱。
: Which of the following is an assumption on which the argument depends?
: A. Not being able to take college-level courses while in prison is unlikely
: to deter anyone from a crime that he or she might otherwise have committed.
这里是一个假设题上很常见的陷阱混淆选项。
遇到带两个否定的因果（如这里的be unlikely to deter表因果）的时候，
要特别注意逻辑上的等价命题：若P则Q只能推到若非Q则非P（注意是逆否），
反之亦然——若非Q则非P 只能推回 若P则Q。
P->Q 绝对可以推出 Q'->P' 但绝对不会等于 P'->Q'
比如若下过雨(P)则地上会湿(Q)，可以推得“若地上没湿(Q')，则一定没下过雨(P')”
但绝对不能说“若没下过雨(P')，则地上一定不会湿(Q')”
强化完这个观念，我们就来看A选项要怎么推等价命题：
Not being able to take college-level courses while in prison (Q') is
unlikely to deter (P') anyone from a crime that he or she might otherwise
have committed.
（Q':若不能上课，则P':不太会停止犯罪）
只能推得P->Q：若可以阻止这些人犯罪，则这些人是会有机会受到教育的。
（很明显的主题无关）
但不能推得Q->P：若能上课则会停止犯罪。
（我猜这就是原po一开始看到A选项会觉得不错的原因：
如果能上课就不会犯罪的话，确认上课必要性，结论不就成立了吗？）
所以请原po以后看到双重否定因果的时候，多留意就好。
不需要每个选项都这样推，太累了XD
Dustin