No one knows why we sleep, but it’s certain that we need to．People who are prevented from sleeping begin to suffer obvious effects after a few days－they think less clearly, and they fall asleep during the working hours．

　　There are no rules about sleep．Generally speaking, grown-ups sleep about 7 and a half hours each night and probably more than 60 percent get between seven and eight hours．But perhaps eight percent are quite happy with 5 hours or less, and four percent or so find that they want ten hours or more．If you feel all right, you’re probably getting enough sleep．The important thing is not to worry how much other people get－their needs may be different．Exercise doesn’t seem to increase the need for sleep－office workers, for example, sleep for about as long as people doing physically active work．

　　Children sleep more than grown-ups－perhaps 14 to 18 hours soon after birth, going down to grown-up levels by early teenagers．Sleep patterns also tend to be different in the old people, who may sleep less at night than they did when younger, find sleep getting more broken, and often make it a rule to sleep during the daytime．

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完形填空

　　One night a man came 　　1　　 to my house．He told me, “There is a family with eight 　　2　　．They have no 　　3　　 to eat for days．” After I asked him 　　4　　 the family was, I took some food 　　5　　 me and left．

　　When I finally got to that family, I 　　6　　 those little children were too hungry to say 　　7　　．There was no sadness in their eyes, just the deep pain of hunger．I gave the food to the mother．She took half of it, and then 　　8　　．When she returned, I asked her, “　　9　　 did you go?” She gave me this simple 　　10　　, “To my neighbors－they are also 　　11　　!”

　　I was not surprised that she gave food to 　　12　　, because poor people are always very kind．But I was surprised that she knew her 　　13　　 were hungry when she was also in 　　14　　 of food．Usually, when we are in trouble, we always 　　15　　 ourselves first．and we have no time for others．

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阅读理解

　　No one knows why we sleep, but it’s certain that we need to．People who are prevented from sleeping begin to suffer obvious effects after a few days－they think less clearly, and they fall asleep during the working hours．

　　There are no rules about sleep．Generally speaking, grown-ups sleep about 7 and a half hours each night and probably more than 60 percent get between seven and eight hours．But perhaps eight percent are quite happy with 5 hours or less, and four percent or so find that they want ten hours or more．If you feel all right, you’re probably getting enough sleep．The important thing is not to worry how much other people get－their needs may be different．Exercise doesn’t seem to increase the need for sleep－office workers, for example, sleep for about as long as people doing physically active work．

　　Children sleep more than grown-ups－perhaps 14 to 18 hours soon after birth, going down to grown-up levels by early teenage(青少年)．Sleep patterns also tend(倾向)to be different in the old people, who may sleep less at night than they did when younger, find sleep getting more broken, and often make it a rule to sleep during the daytime．

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