单项选择题

It is agreed that the () years are a crucial period for first language acquisition.

A. pre-school
B. primary-school
C. middle-school
D. none of the above

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单项选择题

Starting from the pre-linguistic cooing and babbling stage, children move through the()stages, gradually acquiring all the elements and skills of language.

A. one-word, two-word and three-word
B. one-word, two-word and multiword
C. one-word, multiword and sentence
D. one-word, two-word, three-word and multiword

单项选择题

L2 learners’ interim knowledge of the target language is known as(), that is, the language that a learner constructs at a given stage of SLA.

A.Interlanguage
B.Interim language
C.pidgin
D.lingua franca