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
23.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
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
B) will enjoy a better family life
C) can give the dog more freedom
D) will have more confidence in himself
答案：21.C 22.D 23.D 24.A 25.B