单项选择题

Behavior problems of dogs are believed to ______.

A．be just part of their nature
B．worsen in modern society
C．occur when they go wild
D．present a threat to the community
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单项选择题
Effective communication between a dog and its owner is ______.
A．essential to solving the dog's behavior problems
B．the foundation for dogs to perform tasks
C．a good way to teach the dog new tricks
D．an extreme measure in obedience training
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.
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