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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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
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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