单项选择题

The second largest country in the world is______.

A．Russia
B．Canada
C．the United States
D．China
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单项选择题
The most recognizable differences between American English and British English are in______ and vocabulary.
A．structure
B．grammar
C．usage
D．pronunciation
单项选择题
A phoneme is a group of similar sounds called______.
A．minimal pairs
B．allomorphs
C．phones
D．allophones
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