单项选择题

A．He is all right.
B．He is sick.
C．He is working in a hospital.
D．He is giving advice to someone.
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单项选择题
From the last sentence of the first paragraph we can learn that______.
A．in the future all the Americans will use credit cards
B．credit cards are only used in the United States today
C．nowadays many Americans do not pay in cash
D．it is now more convenient to use credit cards than before
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