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[A]The private motor vehicle has given pe......

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单项选择题
The description of the past natural environment is important in that
A．it is one part of human history.
B．it should be included in the history of the universe.
C．it can partly explain the way of life of the people in the past.
D．it decided the human history.
单项选择题
A．beforeB．unlessC．untilD．because
A．before
B．unless
C．until
D．because
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