单项选择题

A.A party is where you go to have a good time.B.Democra……

Which of the following is a good definition？（）

A.A party is where you go to have a good time.
B.Democracy is a system of government in which every citizen in the country can vote to elect its government officials.
C.An astronomer is one who studies astronomy.
D.Pollution is the process that chemicals are dumped into rivers.

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