题目：
多选题
What are the characteristics of the Three Dimensional Approach ?
- A. Foreign teaching involves not only studets, the target language, the environment, cultures of both languages, but also the economic devepment of the country.
- B. It assumes that a foreign language is learned while what is acquired plays only a subsidiary role.
- C. The role of the teacher is to maintain a balance between students, the target language and the environment.
- D. Practice is always done in context.
答案：
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