单项选择题

It can be inferred that______.

A．computers will bring disaster
B．computer industry will not develop faster
C．computers will bring about more convenience to people's life
D．none of the above

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单项选择题

The phrase ring up sales most probably means _______.

A．make an order of goods
B．record sales on a cash register
C．call the sages manager
D．keep track of the goods in stock

单项选择题

From the last sentence of the first paragraph we learn that ______.

A．in the future all the Americans will use credit cards
B．credit cards are mainly used in the United States today
C．nowadays many Americans did not pay in cash
D．it is now more convenient to use credit cards than before