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.
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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.
单项选择题
In the United States influenza is one of the ten principle causes of death.
A．Y
B．N
C．NG
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