单项选择题

According to this passage, some animals have the girl of______.

A．telling people apart by how they behave
B．typing each other
C．telling good people from bad people
D．recognizing human faces
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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
The noise-killing system is net 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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