精选优质文档-倾情为你奉上(8)More rest and fresh airDuring the day we work and play, and at night we sleep. Our bodies rest while we sleep. In the morning we are ready to work and play again. Our bodies grow most while we are asleep. Children usually need sleep when they are tired. We can get better at our lessons after we have had plenty of rest. Boys and girls need ten hours of sleep ever night when they are eight or nine years old. Our bodies need plenty of air when we sleep.If we do not get eno
