单项选择题

We can infer from the first paragraph that______.

A．farming people occupies a small proportion
B．farming people occupies a large proportion
C．the U. S used to be an industrial country
D．the U. S used not to be developed in agriculture
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单项选择题
The expression exposure to' in the sentence in most Chinese learners of English do not have enough exposure to English ... (paragraph 1) might mean______.
A．interest in
B．understanding of
C．expectation to
D．access to
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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