【正确答案】正确答案：The difference between internal and/or external focus to the study of language acquisition. (1) The internal focus seeks to account for speakers' internalized, underlying knowledge of language. The external focus emphasizes language use, including the functions of language which are realized in learners' production at different stages of development. (2) According to the above difference, the linguist Noam Chomsky claims that human beings are biologically programmed for language and that the language develops in the child just as other biological functions such as walking. Originally Chomsky referred to this innate ability as Language Acquisition Device, also known as LAD. Later Chomsky prefers this innate endowment as Universal Grammar (UG) and holds that if children are pre-equipped with UG, then what they have to learn is the ways in which their own language makes use of these principles and the variations on those principles which may exist in the particular language they are learning. The interaetionist view holds that language develops as a result of the complex interplay between the human characteristics of the child and the environment in which the child develops. Integrated with the innatist view, the interaetionist further claims that the modified language which is suitable for the child's capability is crucial in his language acquisition.