题目：
多选题
On Contrastive Analysis, which of the following are true?
- A. Contrastive Analysis claims that a positive transfer is possible if a particular structure is identical in both languages.
- B. It was the belief that almost all errors have their origin in mother tongue interference that gave rise to Contrastive Analysis.
- C. According to Contrastive Analysis, it is the partial similarities that often cause great difficulties.
- D. It focuses on errors caused by the incorrect application of rules in the target language.
答案：
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