单项选择题

A．Reduce the cost of a silencer.
B．Make a silencer unnecessary.
C．Improve the performance of a silencer.
D．Make a car quieter.
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填空题
The common elements in all styles of friendship include ______.
单项选择题
A．They buy expensive things, regardless of quality.B．They don’t mind how much they have to pay for the right things.C．They choose things that salesman recommends.D．They buy good quality and expensive things.
A．They buy expensive things, regardless of quality.
B．They don’t mind how much they have to pay for the right things.
C．They choose things that salesman recommends.
D．They buy good quality and expensive things.
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