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单项选择题

Home computers can be used for ______.

A．writing letters
B．playing games
C．doing business
D．all of the above

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单项选择题Computers used to ______.

A．work rapidly
B．be large and expensive
C．be used for fun
D．be easy to use

单项选择题Salesmen use computers mainly to ______.

A．check the list of goods and materials that are kept in the store house
B．play games for pleasure
C．talk with their friends
D．write letters