单项选择题

A．It increases the cost of car production.
B．Carmakers are not sure if it is useful.
C．The research on it is still being carried out.
D．People still have their doubts.
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单项选择题
A．He tries on some other things that the others think best.B．He usually doesn’t buy anything.C．He spends hours having a look round.D．He buys it so long as its color is right.
A．He tries on some other things that the others think best.
B．He usually doesn’t buy anything.
C．He spends hours having a look round.
D．He buys it so long as its color is right.
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.
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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