题目：
多选题
What are the features of cooperative learning ?
- A. Students help other students within groups of four to five persons in an effort to reach goals.
- B. Emphasis on collaborative efforts of students and teachers working together to pursue goals and objectives.
- C. Cooperative learning produces higher achievement, increases retention and develops interpersonal skills.
- D. It can promote higher self-esteem and acceptance of differences, as well as fostering resposibility.
答案：
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