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
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
单项选择题
According to the passage, which is NOT TRUE of sickle-cell anemia
A．It is inherited.
B．It is not contagious.
C．It can be cured.
D．It occurs mostly in Africans.
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