单项选择题

A．One hour.
B．Haft an hour.
C．Around 20 minutes.
D．As long as Susan wishes.
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单项选择题
A．Computers can bring financial problems.B．Computers can bring unemployment.C．Computers can be very useful in families.D．Computerized robots can take over some unpleasant jobs.
A．Computers can bring financial problems.
B．Computers can bring unemployment.
C．Computers can be very useful in families.
D．Computerized robots can take over some unpleasant jobs.
单项选择题
A．Two million.B．Three million.C．Five million.D．Six million.
A．Two million.
B．Three million.
C．Five million.
D．Six million.
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