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

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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

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