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Rules are everywhere.As middle school students，there are some basic rules which we must obey，such as family rules，school rules，society rules and so on.But have you ever read any rules in the library ？If you know library rules，please tell us .Firstly，_______.

【考点】社会；说明文．

【答案】Rules are everywhere.As middle school students，there are some basic rules which we must obey，such as family rules，school rules，society rules and so on.But have you ever read any rules in the library ？If you know library rules，please tell us .Firstly，you can't speak loudly in the library.Secondly，you can't eat in the library.Thirdly，you can't take the books out of the library.Finally，you can't write in the book.