21.Behavior problems of dogs are believe 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

　　22.The primary purpose of obedience training is to ________.

　　A) teach the dog to perform clever tricks

　　B) make the dog aware of its owners authority

　　C) provide the dog with outlets for its wild behavior

　　D) enable the dog to regain its normal behavior

　　23.Effective communication between a dog and its owner is ________.

　　A) essential to solving the dogs 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

　　24.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.

　　25.When a dog has received effective obedience training, its owner ________.

　　A) can give the dog more rewards

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