单项选择题

The passage is mainly about______.

A．what dogs can do.
B．how to keep dogs.
C．dogs and their masters.
D．reasons for keeping dogs.
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单项选择题
The_______of the word is unknown, but it is certainly not from Greek.
A．origin
B．generation
C．descent
D．cause
单项选择题
How long has the violence lasted
A．For one day.
B．For two days.
C．For the whole summer.
D．For one year.
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