单项选择题

It is ______ who proposed Language Acquisition Device (LAD).

A. Sapir
B. Leech
C. Skinner
D. Chomsky
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单项选择题
______ is the second largest country in the world.
A. Canada.
B.U.S.A.
C. China.
D. Russi
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______ is the study of the internal structure of words, and the roles by which words are formed.
A. Morphology
B. Phonology
C. Phonetics
D. Syntax
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