单项选择题

A．10.
B．20.
C．At least 40.
D．At least 60.
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circulating
单项选择题
A．In the southern provinces.B．In the northern cities.C．In the west.D．In the east.
A．In the southern provinces.
B．In the northern cities.
C．In the west.
D．In the east.
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