单项选择题

Dogs have been the subject of countless experiments because they are similar to human beings in ______.

A．habit
B．structure
C．temperament
D．appearance
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单项选择题
When they drove down into the city centre, they found it was not so peaceful after all! This means ______.
A．it was very noisy
B．there was a lot of traffic
C．it was less quiet than it had looked
D．it had become very noisy since it was first built
单项选择题
The dog has always been noted for ______.
A．protecting children
B．assisting shepherds
C．helping hunters
D．herding cattle
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