单项选择题

The ______ age for the acquisition of the first language coincides with the period of brain lateralization.

A. young
B. old
C. critical
D. flexible
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单项选择题
The word boyish contains two ______.
A. phonemes
B. morphs
C. morphemes
D. allomorphs
单项选择题
A ______ is a variety of language that serves as a medium of communication among groups of people for diverse linguistic backgrounds.
A. lingua franca
B. pidgin
C. creole
D. national language
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