单项选择题

A．population
B．force
C．people
D．workers
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reasons
单项选择题
A．It is smaller than in winter.B．It is twice as large as usual.C．It is average.D．It is more than average.
A．It is smaller than in winter.
B．It is twice as large as usual.
C．It is average.
D．It is more than average.
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