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
The primary purpose of obedience training is to ______.
A．teach the dog to perform clever tricks
B．make the dog aware of its owner's authority
C．provide the dog with outlets for its wild behavior
D．enable the dog to regain its normal behavior
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