22.Language teachers are expected to design speaking or writing exercises that make demands on learners for correct and appropriate use of the target language in order to develop certain grammatical features that do not appear to be acquired purely on the basis of comprehending input. Which theory best supports this claim?
(A) Internal cause hypothesis
(B) Critical period hypothesis
(C) Input hypothesis
(D) Comprehensible output hypothesis

Language teachers are expected to design speaking or writing exercises that make demands on learners for correct and appropriate use of the target language in order to develop certain grammatical features that do not appear to be acquired purely on the basis of comprehending input. Which theory best supports this claim?
(A) Internal cause hypothesis
     ---(The hypothesis of linguistic universals語言普遍性理論? #Chomsky#core grammar#peripheral grammar)
(B) Critical period hypothesis關鍵期假說
(C) Input hypothesis 輸入理論假說
(D) Comprehensible output hypothesis
      ---(The habit-formation theory習慣形成理論? #behaviourist psychology#imitation #practice)