问答题 Tell the sense relation between a and b in each pair:
1)a. John visited Beijing.
b. John visited China.
2)a. Mary is more sensitive than Jane.
b. Jane is less sensitive than Mary.

【正确答案】1)Entailment: sentence a entails b．2)Synonymy: sentence a is synonymous with sentence b．

【答案解析】[解析] 本题考查的是句子之间的关系。蕴涵关系为：A蕴涵B，当且仅当：A真B必真，A假B可真可假，B假A必假。同义关系为：A真，B亦真；A假，B亦假。