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单项选择题

A．11 - week course for control duty.
B．11 - week course for patrol duty.
C．9 -week course for control duty.
D．9 -week course for patrol duty.
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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．A TV set.B．A stereo.C．An alarm clock.D．A battery -operated clock radio.

A．A TV set.
B．A stereo.
C．An alarm clock.
D．A battery -operated clock radio.