Alan Leshner, a former director of the US National Institute on Drug Abuse, said, “This study emphasizes the multi-aspect 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 long-lasting 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．”

　　63．The article is intended to ______．

　　A．explain the bad effects of drugs on people’s health

　　B．warn young people of the risk of taking the drug Ecstasy

　　C．persuade people out of such bad habits as smoking and using drugs

　　D．tell us the links between the drug Ecstasy and Parkinson’s disease

　　64．We know from the passage that a low dose of Ecstasy ______．

　　A．won’t cause serious brain damage

　　B．can permanently destroy one’s brain cells

　　C．will result in immediate symptoms

　　D．may bring on Parkinson’s at once

　　65．Why are squirrel monkeys and baboons involved in the experiments?

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