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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nature
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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