①the theory of language underlying the communicative approach
②the theory of learning underlying the communicative approach
③one of the objectives of the communicative approach
④one of the techniques of the communicative approach
⑤one of the main features of the communicative approach
B
a. language best learned through use in social context
b. to develop the students' communicative competence
c. role play
d. functional linguistics
e. the introduction of authentic texts into the learning situation
①