单项选择题

Native speakers can identify that a person is not a native speaker by______.

A．his maturation of the brain
B．his accent
C．his vocabulary
D．his grammar
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单项选择题
We can infer from the first paragraph that______.
A．the hypothesis is true for acquiring the vocabulary
B．the hypothesis is true for acquiring the grammar
C．researchers hold different views towards the hypothesis
D．researchers agree on the hypothesis
单项选择题
New York City consists of______.
A．five independent counties
B．five districts and five counties
C．five separate districts as well as Arlington County
D．five separate townships
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