※ 引述《Birou (十里春風不如你)》之銘言：
: 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時，建議能夠練習縮減資訊精煉故事：
為了減少犯罪率，政府打算不讓囚犯上課。
但是這會跟目的牴觸，因為有上課的出獄後再犯次數較低。
相信原PO對C的答案思路應該沒什麼問題，做題時應該是A/C在猶豫。
所以這裡專門針對A分享一些實戰中邏輯要高分必須注意的陷阱。
: 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.
這裡是一個假設題上很常見的陷阱混淆選項。
遇到帶兩個否定的因果（如這裡的be unlikely to deter表因果）的時候，
要特別注意邏輯上的等價命題：若P則Q只能推到若非Q則非P（注意是逆否），
反之亦然——若非Q則非P 只能推回 若P則Q。
P->Q 絕對可以推出 Q'->P' 但絕對不會等於 P'->Q'
比如若下過雨(P)則地上會濕(Q)，可以推得「若地上沒濕(Q')，則一定沒下過雨(P')」
但絕對不能說「若沒下過雨(P')，則地上一定不會濕(Q')」
強化完這個觀念，我們就來看A選項要怎麼推等價命題：
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':若不能上課，則P':不太會停止犯罪）
只能推得P->Q：若可以阻止這些人犯罪，則這些人是會有機會受到教育的。
（很明顯的主題無關）
但不能推得Q->P：若能上課則會停止犯罪。
（我猜這就是原po一開始看到A選項會覺得不錯的原因：
如果能上課就不會犯罪的話，確認上課必要性，結論不就成立了嗎？）
所以請原po以後看到雙重否定因果的時候，多留意就好。
不需要每個選項都這樣推，太累了XD
Dustin