单选题
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______.
A、
sentence (a) presupposes sentence (b)
B、
sentence (a) entails sentence (b)
C、
sentence (a) is inconsistent with sentence (b)
D、
sentence (a) contradicts sentence (b)
【正确答案】
B
【答案解析】
解析：如果a蕴含b，那么它们存在着如下的真值关系：当a为真时，b也一定为真；当b为假时，a为假。
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