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nature
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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
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