25.In which of the following does the (a)-sentence NOT entail the (b)-sentence?
(A) (a) X is a cat. (b) X is an animal.
(B) (a) X is a cat. (b) X is a quadruped.
(C) (a) All dogs are purple. (b) My dog is purple.
(D) (a) X is a cat. (b) X has four legs.

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統計： A(6), B(22), C(35), D(76), E(0) #3241355

詳解 (共 2 筆)

#6405125
(D) (a) X is a cat....
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#6265167
比較(B)和(D)
(B) (a) X is a cat. (b) X is a quadruped.
X是貓，那麼X是四足動物。
(D) (a) X is a cat. (b) X has four legs.
X是貓，那麼X有四條腿。

貓一定是四足動物(天生基因)，但有可能因為受傷不一定有四條腿。
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