单项选择题

A．It begins on campus.
B．It’s five miles long.
C．It circles the campus.
D．It takes a few days to cover.
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单项选择题
A．Less than ten minutes.B．About twenty minutes.C．Forty-five minutes.D．Over an hour.
A．Less than ten minutes.
B．About twenty minutes.
C．Forty-five minutes.
D．Over an hour.
填空题
economics
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