单项选择题

What is this passage mainly about

A．Approaches to the commercial use of computers.
B．Conveniences brought about by computers in business.
C．Significance of automation in commercial enterprises.
D．Advantage of credit cards in business.

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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

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