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
According to the passage parents and coaches should______.
A．help children to win every game
B．pay more attention to letting children enjoy sports
C．enable children to understand the positive aspect of sports
D．train children to cope with stress
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