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
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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
单项选择题
The terrible pain during a crisis is caused by______.
A．the angular shape of the defective blood cells
B．the cutoff of oxygen supply in parts of the body
C．the cells stuck in the blood vessels
D．eating spoiled food
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