单项选择题

A．Because they did not eat other animals.
B．Because they were useful for protection.
C．Because they were good hunters.
D．Because they always obeyed their masters.
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单项选择题
A．In the early 1930’s.B．During his childhood.C．Three years ago.D．When he was twenty-two.
A．In the early 1930’s.
B．During his childhood.
C．Three years ago.
D．When he was twenty-two.
单项选择题
A．For protection against other animals.B．For protection against other dogs.C．Just for fun.D．For the purpose of guarding the house.
A．For protection against other animals.
B．For protection against other dogs.
C．Just for fun.
D．For the purpose of guarding the house.
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