LSAT 黄皮书下册SET 4 SECTION 2 Q21

mythicalman

21. Newspaper editor: Law enforcement experts, as well as most citizens, have finally come to recognize that legal prohibitions against gambling all share a common flaw no matter how diligent the effort, the laws are impossible to enforce. Ethical qualms notwithstanding, when a law fails to be effective it should not be a law. That is why there should be no legal prohibition against gambling.

Which one of the following if assumed. allows the argument's conclusion to be properly drawn?

(A) No effective law is unenforceable

(B) All enforceable laws are effective

(C) No legal prohibitions against gambling are enforceable

(D) Most citizens must agree with a law for the law to be effective

(E) Most citizens must agree with a law for the law to be enforceable.


A

请问ANSWER A如何理解
No effective law is unenforceable.
A represents effective law, B represents enforcable
The above structure is:
~A->~B
or
A->~~B, i.e. A->B
换句话说，这个NO到底否定的是A还是~b?

番茄炒蛋

文中就是三个词在搞，law  effective  unenforceable
文中的道理要成立，这三个词就必须两两之间都要有关系
原文中已经有两对搭上了，剩下的也就是答案中的那一对了
可以理解为 enforceable law 才是 effective law
感觉这种题目就是让你找联系，假设题的这种方法很有效