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highway system
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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