单项选择题

Cattle raising is not necessarily a profitable business because ______.

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
Which of the following does not characterize Mercury
A．nearest of all planets to the sun
B．extremely hot
C．little known to people
D．biggest of all planets
填空题
nature
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