西湖龙井、铁观音、君山银针、庐山云雾，从茶叶的外形色泽或汤色命名来说分别属于什么茶？

The objectives of the Cognitive Approach are （）.

A．to develop in the students the native-like competence

B．to develop intuitive thinking and enable the learners to learn from errors

C．to develop strategies of language use

D．all of the above