6)【考点提示】本题考查的是乔姆斯基提出的语言运用和语言能力的差异性。 【解题思路】首先解释语言运用和语言能力的概念，再说明二者的区别。 【参考答案】 This fundamental distinction is discussed by the American linguist Chomsky in his Aspect of the Theory of Syntax. A language user's underlying knowledge about the system of rules is called his linguistic competence, while performance refers to the actual use of language in concrete situation.