A study by a team at Johns Hopkins University in Baltimore，Maryland，involving squirrel monkeys and baboons(狒狒) found that both species suffered permanent damage to key cells，which are lost in Parkinson's disease, after receiving three low doses(剂量) of Ecstasy at threehour periods.

　　The study is particularly important because baboons are one of the best animal models for the human brain.George Ricaurte，who led the research，said that the widespread abuse of drug might have caused severe damage.“The most troubling result is that young adults using Ecstasy may be increasing their risk of developing Parkinsonism as they get older.”

　　Alan Leshner，a former director of the US National Institute on Drug Abuse，said，“This study emphasizes the multiaspect damage that Ecstasy causes to users.We've long known that repeated use damages brain cells.But this study shows that even very occasional use can have longlasting effects on many different brain systems.It sends an important message to young people：don't experiment with your own brain.”

　　Janet Betts，a mother whose teenage daughter Leah died after a single Ecstasy tablet in 1995，said，“This comes as no surprise.But people can't see the effects at first，and they say it won't happen to them.We'll see the symptoms later，just as we have with smoking.”

　　[解题导语]　本文是一篇应用文，研究表明：一粒小小的摇头丸在使你迷幻的同时，对你的脑细胞造成了永久性的损害。

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