单项选择题

The author's experience shows that he was ______.

A．creative
B．ambitious
C．unrealistic
D．irrational
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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
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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