单项选择题

A．the demand is too low
B．the supply is too large
C．the cost is too high
D．the price is changeable
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单项选择题
A．nearest of all planets to the sunB．extremely hotC．little known to peopleD．biggest of all planets
A．nearest of all planets to the sun
B．extremely hot
C．little known to people
D．biggest of all planets
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