多选题 On Contrastive Analysis, which of the following are true? 的答案

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

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