单项选择题

The noise-killing system is not yet popular mainly because ____________.

A．it is still being tried out
B．drivers still have their doubts
C．it increases the cost of car production
D．carmakers are not sure if it is necessary
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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
单项选择题
Why did Elizabeth say to her father, But, Dad, you can't be healthy if you are dead
A．He was driving at great speed.
B．He was running across the street.
C．He didn't have his safety belt on.
D．He didn't take his medicine on time.
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