[单选题]The conversational implicature of "John is a machine" as a response to "what do you think of John" is context-bound. It possesses all the following distinguishing properties but（）.

non-detachability

calculability

conventionality

defeasibility

正确答案：C

题目解析

本题考查语言学中的会话含义理论。约翰是一台机器，需要在固定的语境中才能表达一种含义，因此和语境是分不开的，选项中A、B、D三项都是会话含义的特点。只有C项“约定俗成性”不是会话含义的特点，故选C。

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[单选题]The conversational implicature of "John is a machine" as a response to "what do you think of John" is context-bound. It possesses all the following distinguishing properties but（ ）.