American linguists Krashen puts forward Input Hypothesis and Affective Filter Hypothesis, which play an important role in second language acquisition and the improvement of learners’language abilities. Analyzing these two hypotheses and illustrating how to put them into teaching of college English will help establish new teaching modes, thus improving teaching efficiency.% 美国语言学家Krashen提出了对外语界影响颇深的输入假设和情感过滤假设,这两大假设在第二语言习得过程中对学习者语言能力的提高起着重要的作用。把两大假设理论运用到大学英语教学中去,能够确立新型大学英语教学模式,提高大学英语教学的效率。
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