( )4.How much sleep should boys and girls of nine years have

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( )4.How much sleep should boys and girls of nine years have every night?A.Eight hours B.Nine
we are ready to work and play again.While we are asleep our bodies grow most.Children usually need more sleep.We can get our lessons better and we feel better too,when we have plenty of rest.Boys and girls need ten hours of sleep every night when they are eight or nine years old.Our bodies need lots of air when we sleep.If we do not get enough fresh（新鲜的）air we’ll feel tired when we wap.While in bed we must not cover our heads.If we do,our lungs（肺）will not get enough fresh air.If we open our windows at night we can have plenty of fresh air.Cool air is better then warm air.Boys and girls must get enough sleep if they want to grow and be strong.

是不是没有正确答案,根据你的文章 Boys and girls need ten hours of sleep every night when they are eight or nine years old 应该是 TEN

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