单项选择题

A．Catching runaway criminals.
B．Scratching the hidden bombs.
C．Patrolling the dangerous town.
D．Drug-sniffing or bomb-sniffing
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单项选择题
A．Wind speed.B．Rainfall.C．Water temperature.D．Direction of approach.
A．Wind speed.
B．Rainfall.
C．Water temperature.
D．Direction of approach.
单项选择题
A．Computers have become part of our daily lives.B．Computers have advantages as well as disadvantages.C．People have different attitudes to computers.D．More and more families will own computers.
A．Computers have become part of our daily lives.
B．Computers have advantages as well as disadvantages.
C．People have different attitudes to computers.
D．More and more families will own computers.
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