单项选择题

Besides its main use the noise killing system can

A．make a car lighter
B．make a car quieter
C．reduce the cost of a silencer
D．improve the performance of a silencer
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单项选择题
The underlined word event ( Paragraph 1 ) refers to______.
A．landslide
B．machine
C．earthquake
D．flood
单项选择题
What does the robot look like
A．A human being.
B．A spider.
C．A truck.
D．A drill.
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