试题题干
Filling Blanks: You are to fill each blank with ONE appropriate word.
According to Krashen, the only way for people to acquire a language is by understanding messages or receiving comprehensible 
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参考答案
试题解析
克拉申的语言输入假设认为，人们习得语言的唯一途径是理解信息，即接受“可理解输入”。