单项选择题

A．Two.
B．Three.
C．Five.
D．Seventeen.
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单项选择题
A．Supply usually outnumbers demand.B．Demand usually outnumbers supply.C．Supply is usually equal to demand.D．When supply exceeds demand, prices rise.
A．Supply usually outnumbers demand.
B．Demand usually outnumbers supply.
C．Supply is usually equal to demand.
D．When supply exceeds demand, prices rise.
单项选择题
A．In a laboratory.B．In a drugstore.C．In a supermarket.D．In the dining hall.
A．In a laboratory.
B．In a drugstore.
C．In a supermarket.
D．In the dining hall.
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