单项选择题

A．The computer will turn the generator on.
B．Energy stored in the batteries will run the electric motor.
C．The boat will not meet the commercial schedule.
D．The boat will certainly slow down.
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单项选择题
A．About $200.B．About $2,000.C．About $500.D．None of the above.
A．About $200.
B．About $2,000.
C．About $500.
D．None of the above.
单项选择题
A．A shop assistant.B．A sales clerk.C．A waiter.D．A telephone operator.
A．A shop assistant.
B．A sales clerk.
C．A waiter.
D．A telephone operator.
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