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　　Many children think mobile phones are cool．Mobile phones have nice colours and you can use it to talk with a friend at anytime and anywhere．In the USA，more than 90 million people use mobile phones．Many of them are children．For children，mobile phones are more than phone calls．They are fashionable．

　　Most mobile phone users don't know that some health problems have something to do with using mobile phones．Some scientists say that mobile phones give off radiation(辐射)and it may be bad for users．One study shows that mobile phone radiation can make people get some kinds of cancers(癌症)．Other scientists say mobile phones have nothing to do with people's health．

　　Scientists say that people can keep themselves away from mobile phone radiation．One way is to use an earphone(耳机)．Or people can make shorter calls．

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阅读理解

　　In many British schools, the pupils usually wear their school uniforms to school on weekdays．However, recently the students at LVS Ascot Junior School in England wore something quite different．What they wore was what people wear when they go to bed－pyjamas(睡衣)．They did this not only for fun, but for a local charity called Christopher's Smile．

　　Christopher's Smile was set up in 2008 by Karen ＆ Kevin Capel whose only son Christopher died of cancer at a young age．They hope their charity will help pay for more research into children's cancers．Since then, the charity has raised a lot of money and gotten more and more volunteers．Every year, thousands of people take part in different activities such as charity walk or run to show their support for Christopher's Smile．

　　The students of Grade 6 at LVS Ascot Junior School also wanted to do something for the sick children．They organized the event “Pyjama Day” to support Christopher's Smile．“We wanted to raise money for our charity in a way that the whole school could join in it, so each pupil paid ￡1 to wear his or her pyjamas to school on Pyjama Day,” said the young organizers．Both the students and their teachers took part in the event with great interest．Together they not only raised some money, but also had a good time．

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阅读理解

　　Two American scientists told the people in industrial nations that they would be much healthier if they ate more of the same kind of foods eaten by humans living more than 10,000 years ago．

　　The scientists say that the human body has changed very little since human first appeared on earth, but the way we live has changed greatly．Our body has not been able to deal with these changes in life style and this has led to new kinds of sicknesses．These new sicknesses were not known in ancient times．So they are called “diseases of civilization(文明)”．Many cancers and diseases of the blood system, including heart attacks and strokes(中风)are examples of such diseases．

　　Scientists noted that early stone-age people used very little alcohol(酒精)or tobacco, probably none．Ancient people also got a great deal of physical exercise, but a change in food is one of the main differences between life in ancient times and life today．Stone-age people hunted wild animals for their meat, which had much less fat than farm animals．They also ate a lot of fresh wild vegetables, and fruits．They did not use milk and other dairy products, and they made very little use of grains．But today, we eat a large amount of dairy products and grain foods．We eat six times more salt than stone-age people．We eat more sugar．We eat twice as much fat but only one third as much protein(蛋白质)and much less vitamin C．

　　People today probably do not want to live as people thousands of years ago did, but scientists say that we would be much healthier if we ate as those ancient people did, cutting the amount of fatty, salty and sweet foods．

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