In order to acquire a second language， learners will subconsciously use their first language knowledge in learning a second language. This is know as language t（）.

The brain’s neurological specialization for language is called linguistic I （）， which is specific to human beings. 点击查看答案

In many societies of the world， we find a large number of people who speak more than one language. As a characteristic of societies， b（） inevitably results from the coming into contact of people with different cultures and different languages. 点击查看答案