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
The reason Father was in a hurry to get home was that he________.
A．wasn't feeling very well
B．hated to drive in the dark
C．wanted to take some exercise
D．didn't want to be caught by the police
单项选择题
According to the text, to be thrown clear of a serious accident is very dangerous because you________.
A．may be knocked down by other cars
B．may get seriously hurt being thrown out of the car
C．may find it impossible to get away from the seat
D．may get caught in the car door
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