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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阅读理解，阅读下列内容，根据内容选择最佳答案。

　　One day, when I arrived at school, an ice cream truck was parked in the schoolyard．Ice cream men usually drove their trucks to primary schools．I had never thought one ice cream truck would come to bring ice cream to us older kids．When I went up to the truck, I was quite surprised to hear the man call out, “Free ice cream! ” To make sure of his words, I asked, “I'm sorry, what did you say? ” “Free ice cream．Choose whichever you like．” he said smiling．

　　After I was certain that the man was just giving away the ice cream, I talked with him for a long time．He told me that his dream had always been to travel around giving away ice cream, and that's what he was now doing．With his mother's support, he kept doing what he loved even during hard times．Now, however, some large companies are helping him his plan．

　　The man said he wanted to encourage people to do exactly what their heart told them to do with their lives．I kept asking him, “So your dream was just to drive around and give away ice cream? It seems like a very unusual goal．” “Yes, just meeting people and making them smile, ” he replied．At that point he handed me my ice cream．I thanked him, but what I got from him was much more than just an ice cream．It can't easily be expressed in words．I believe what he was doing is exactly what great people do all the time：small acts of big love．

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阅读理解

　　Advice on Doing Your Homework

　　Never try to work when you are very hungry．If you want to do your home-work right after school，you may want to eat something before getting to work．Al-ways do your homework before you get too tired．Don't wait until late in the evening， or the assignment will seem much harder than it really is．

　　Divide your time into a few parts if you have more than an hour's work．Relax yourself after an hour．However，don't divide it up so much that you can't get any-thing done．You should be able to work at least half an hour at a time without stopping．

　　Don't put off(推迟)until the last minute．If you put off doing your home-work，you will have it on your mind and you won't enjoy your free time．If you put off until the end of the week or until right before a test，you will have too much to do．A little bit each night，enough to keep up with what is happening each day in school，will take the fear out of tests and keep you on top of it．

　　Do your homework at the same time every day．This will help you make it a habit梡art of your daily work．It will make it easier to do，and it will make your free time more enjoyable as well．

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