单项选择题

Behavior problems of dogs are believed to______.

A．be just part of their nature
B．worsen in modem society
C．occur when they go wild
D．present a threat to the community
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单项选择题
Why do pet dogs love performing tricks for their masters
A．To avoid being punished.
B．To show their affection for their masters.
C．To win leadership of the dog pack.
D．To show their willingness to obey.
单项选择题
When a dog has received effective obedience training, its owner______.
A．can give the dog more rewards
B．will enjoy a better family life
C．can give the dog more freedom
D．will have more confidence in himself
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