Proposed by Lenneberg (1967), Critical Period Hypothesis holds that a child can naturally acquire a language from the age of two to twelve. The age effect does play an important role in language acquisition. But language acquisition or learning is affected by a great many factors such as motivation, interest, language atmosphere, etc.So this hypothesis is partially sensible.

本题考查语言习得的关键期理论。 首先分析这一理论的主要观点，然后结合自己的观点对该理论作出评价， 包括支持的和反对的方面。