5Pinker S. The Language Instinct [ M ]. Penguin Books, 1994.
6Chomsky N. Language and nature [ J ]. Mind,1995,(1).
7Brown H D. Principle of Language Learning and Teaching [M]. Englewood Cliffs, NJ : Prentice-Hall, 1980.
8Swain M. Communicative competence: some roles of comprehensible input and comprehensible output in its development [A]. Gass S, Madden C. Input in Second Language Acquisition [C].Rowley, MA: Newbury House, 1985. 235-253.
9Heaton J B. Classroom Testing [ M ]. Longman,1990.