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

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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

In the Middle Ages, the copying work of books was mainly done by______.

A．monks
B．intellectuals
C．artists
D．merchants

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