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llmboy · 发表于 2009-3-16 08:00:00

If the City Parks Department receives the same allocation in next year’s municipal budget, it is expected to raise admission fees to the indoor recreation center by fifty cents. If the City Parks Department announces a higher admission fee increase, then its budget allocation for next year must have been reduced.

Which of the following selections expresses a reasoning pattern most similar to the pattern expressed in the passage?

(A)
If the mountains continue to receive snow at the rate experienced for the past two weeks, ski areas would have a record snow base this winter. Instead, snow fall diminished, and ski areas have a normal ski base this winter.

(B)
If urban neighborhoods wish to reduce crime in their neighborhoods wish to reduce crime in their neighborhoods, they should implement neighborhood crime watch programs. If neighborhoods experience higher burglary and theft rates, it must mean that they have not have implemented crime watch programs.

(C) If the price of raw plastic pellets remains the same, companies that manufacture molded plastic parts such as fishing bobbers can be expected to keep their wholesale prices at last year’s level. Thus, if these wholesalers raise their prices on fishing bobbers, it will be because raw material costs increased.

(D)
If major league baseball teams wish to increase attendance at home games, they should not increase their ticker prices. If they do increase ticker prices, they should be expected to provide better seating and concessions at the stadiums.

(E)
If television networks want to broadcast quality programming, they should recruit programs with good writers and actors.
Thus, if the networks recruit poorly written and poorly acted programs, it is likely their television viewership will decline.

问题：答案（C）。我理解（C）的结构是逆否命题式，但我不理解为什么题干也是contrapositive。

rsa代表 receives the same allocation
raf代表raise admission fees
---代表“否”

则我以为题干结构如下：
rsa----> raf

raf
---------------------
所以 ---rsa

请L友们指点，多谢。

crusoecrusoe · 发表于 2009-3-17 15:01:00

答案C的确是逆否命题，题干却显然不是逆否命题。

而逻辑相似并不是因为“逆否命题”，而是“因果倒置”。

不对之处，请指正。

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