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[FONT=宋体]0928a[/FONT][FONT=宋体][/FONT]​[FONT=宋体]New studies aim to expand knowledge of autism[/FONT]​This is the VOA Special English Health Report.​Scientists are trying to better understand autism. The National Institute of Mental Health in Bethesda, Maryland, recently announced the start of three major studies of autism. ​Autistic children experience delays in the development of social and communication skills. They may also show limited interests and repeat the same actions over and over. ​Autism generally appears by the age of three. It is part of a larger group of disorders, often called autism spectrum disorders. Others include Asperger's syndrome and pervasive developmental disorder. ​One of the three new studies will define differences in autistic children with different developmental histories. Another will measure the effectiveness of an antibiotic medicine as a treatment for one kind of autism. And the third study will examine if chelation treatment is effective against autism. ​Chelation removes heavy metals from the blood; for example, in cases of lead poisoning. But many parents seek this treatment for autistic children. They believe that many cases of autism were caused by vaccines that contained thimerosal, a mercury-based preservative. That theory is debated. ​Institute officials note that chelation does not target mercury alone. It can also remove minerals that the body needs, such as calcium, iron and zinc. ​Researchers will do a controlled study to test the effectiveness and safety of chelation for children with autism spectrum disorders. ​Institute officials say these disorders are currently reported to affect as many as six out of every 1,000 children. ​In an unrelated study, scientists have reported that a man's age could affect the chances that his children will develop autism. The study found that men age forty and older had autistic children almost six times as often as fathers under the age of thirty. ​Men in their thirties were about one and one-half times more likely to father an autistic child as dads in their twenties and teen years. ​The study, in children born in Israel in the nineteen eighties, found no link between autism and older mothers. The findings appeared in the Archives of General Psychiatry. ​And that's the VOA Special English Health Report, written by Caty Weaver. Internet users can learn more about health issues and download archives of our reports at www.unsv.com. I'm Steve Ember.

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如何上传附件？mp3?

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who tall me? thanks.

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如果太大,压缩成ZIP 文件

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Renee**************** 超赞 赏 爱德华 0$(VIP 0) 2342006-10-10#5 还是传不上去。

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This is IN THE NEWS in VOA Special English.试一下http://language.chinadaily.com.cn/audio/special/2006/09/0928a.mp3

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ok,可以啦。谢谢大家。

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谢谢!

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天空没有翅膀的痕迹，而我已飞过～～This is IN THE NEWS in VOA Special English.试一下http://language.chinadaily.com.cn/audio/special/2006/09/0928a.mp3点击展开...谢谢！[REAL]http://language.chinadaily.com.cn/audio/special/2006/09/0928a.mp3[/REAL]点击那个realplear的图标，然后插入你给的链接地址是可以直接出现这个画面，被大家直接收听的。或者，你可以记住这个命令“[r eal ]”加+“[/ r eal]”.使用的时候把引号和空格去除在两个命令中间加入链接地址就可以了

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喂，请问是中国移动吗？我是中国联通，我的小灵通坏了，你们能派中国铁通来修一下吗？ 超赞 赏 爱德华 0$(VIP 0) 2342006-10-14#10 谢谢Aim.试试mp3.http://forum.iask.ca/attachment.php?attachmentid=40675&stc=1&d=1160835955

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没有成功？

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喂，请问是中国移动吗？我是中国联通，我的小灵通坏了，你们能派中国铁通来修一下吗？ 超赞 赏 爱德华 0$(VIP 0) 2342006-10-15#12 遗憾，没有成功。

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考考你的听力 （更新）This is the VOA Special English Economics Report. A listener in Manaus, Brazil, Luiz Roberto Alves da Costa, has a question about money. He asks why the American dollar is more stable or secure than most currencies in the international monetary system. Stability in the value of a nation's currency depends on foreign exchange markets and economic conditions. The clearest measure of stability is the exchange value of a currency over time. Trading takes place on foreign exchanges around the world. Since 1976, most major economies have used a system of floating exchange rates to value their currency. This means the value of one currency is always changing in relation to others. People who travel pay the spot exchange rate when they have to trade currency. If they wait long enough at the exchange office, they might see the rates change a little within hours or even minutes. Companies and individuals buy and sell an estimated 600,000 million dollars on the spot market each day. The dollar is by far the world's most traded currency. And it is worth more than most. The euro, however, is currently worth about one dollar and 27 cents. And the British pound buys almost two dollars. A costly currency adds to the price of exports. That can hurt economic growth. Trade deficits can also grow because a strong currency lowers the cost of imports. Inflation is another influence on the value of money. High inflation cuts the buying power of a currency over time. The United States currently has a yearly inflation rate of about three percent. The Federal Reserve considers this within acceptable limits. This week the central bank left interest rates unchanged for the third month, after seventeen increases. Economic growth has slowed this year and inflationary pressures are expected to ease over time. Even the strongest currencies change in value over time. But there is one basic reason why the market for dollars is mostly stable. The dollar is the currency of the world's biggest economy, worth twelve million million dollars. Larger markets are generally more stable than smaller ones. And nations that trade with the United States, especially in East Asia, continue to accept dollars for the goods they sell to Americans. But there are other issues to consider about the dollar and its place in the world, and we will examine these in an upcoming report. And that's the VOA Special English Economics Report. I'm Mario Ritter.

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