单项选择题

In recent years, computer are being made ______.

A．smaller and cheaper
B．larger and more expensive
C．more difficult to use
D．to work more slowly
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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
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