What is the main topic of the lecture? A. The reasons people are not always truthful in conversations.B. The need for greater regulation of language used in advertising. C. The need for maximum precision and detail in everyday conversation.D. The role of certain rules in determining what a speaker means.
教授开篇提到人们沟通交流遵循某些原则，然后提到 Gricean Maxims 这一沟通规则，后文就格赖斯格言的各个方面进行了详细的阐述和举例，所以 D 选项正确。
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