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  3. When the truth of sentence(a)guarantees the truth of sentence(b)and the falsi...

When the truth of sentence(a)guarantees the truth of sentence(b)and the falsi...

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问题 When the truth of sentence(a)guarantees the truth of sentence(b)and the falsity of sentence(b) guarantees the falsity of sentence(a)，we can say that_________．
选项 A.sentence(a)presupposes sentence(b)

B.sentence(a)entails sentence(b)

C.sentence(a)is synonymous with sentence(b)

D.sentence(a)contradicts sentence(b)
答案B
解析题干描述的是句子(a)和句子(b)的真值条件，即如果(a)为真，那么(b)也为真；如果(b)为假，那么(a)也为假。由此判断，句子(a)的含义蕴涵于句子(b)的含义，选B。
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