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单项选择题These references most probably appear ______.

A．below an article on water purification
B．below an article on health and medicare
C．in a do-it-yourself book
D．in an operation manual

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.