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．Two blocks.B．Five blocks.C．Three blocks.D．Four blocks.
A．Two blocks.
B．Five blocks.
C．Three blocks.
D．Four blocks.
单项选择题
No direct relationship has been proven between high cholesterol levels and heart attacks.
A．Y
B．N
C．NG
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