对第一道题目，用以下方式解释了以下，好像比较清楚。 1. If the law punishes littering, then the city has an obligation to provide trash cans. But the law does not punish littering, so the city has no such obligation.
A. the law punishes littering B. the city has an obligation to provide trash cans. A->B, 是原命题
Not A. the law does not punishes littering Not B. the city has no obligation to provide trash cans Not A->Not B 是A->B的否命题。
Which one of the following exhibits a flawed pattern of reasoning most similar to that in the argument above?
(A) If today is a holiday, then the bakery will not be open. The bakery is not open for business. Thus today is a holiday.
A. today is a holiday B. the bakery will not be open A->B 是原命题 B->A 是逆命题
(B) Jenny will have lots of balloons at her birthday party. There are no balloons around yet, so today is not her birthday. A. Jenny will have lots of balloons at her birthday party B. there are no balloons around yet C. today is not her birthday A&B are the premise, and C is the conclusion.
(C) The new regulations will be successful only if most of the students adhere to them. Since most of the students will adhere to those regulations, the new regulations will be successful. A. only if most of the students adhere to the new regulations B. the new regulations will be successful A->B 是原命题 后句只是重新阐述了这个命题。
(D) In the event that my flight had been late, I would have missed the committee meeting. Fortunately, my flight is on time. Therefore, I will make it to the meeting. A. my flight had been late B. I would have missed the committee meeting A->B 是原命题 Not A. my flight is on time (not late) Not B. I would make it to the meeting (which means I won’t missed the meeting) Not A->Not B 是A->B的否命题。
(E) When the law is enforced, some people are jailed. But no one is in jail. So clearly the law is not enforced. A. the law is enforced B. some people are jailed A->B 是原命题 Not A. the law is not enforced Not B. no one is in jail Not B -> Not A,是原命题的逆否命题。
Notice the phrase "switch back"? That phrase limits the scope of the question to those who are currently using natural gas and who will switch back to oil.
B) basically has no impact on the decision of these people, because it does not give any info about oil heating.
i don't think the logic for c is like what you said.i think for c, it should be : B, if A; Since A, then B. The latter part is simply repeating the former part. How do you think?
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发表于 2012-6-28 22:22:05
