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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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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What is advertised for sale
A．A type of diesel engine.
B．A type of car.
C．Tourist guidance.
D．A type of diesel.
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