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
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.
单项选择题
What is the advice given in the text
A．Never drive faster than 30 mph.
B．Try your best to save yourself in a car accident.
C．Never forget to wear the safety belt while driving.
D．Drive slowly while you're not wearing a safety belt.
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