A single night of taking the drug Ecstasy can cause serious brain damage and hasten the【C1】______of Parkinson" s disease, scientists say. Just two to three Ecstasy tablets-a quantity that thousands of clubbers take during raves-can permanently【C2】______brain cells that affect movement and【C3】______, according to American research that【C4】______the drug to Parkinson" s for the first time. A study by a team at Johns Hopkins University in Baltimore, Maryland,【C5】______monkeys and baboons found that both species of primate【C6】______irreversible damage to key cells【C7】______dopamine neurons, which are lost in Parkinson" s, after receiving three low doses of Ecstasy at three-hour【C8】______. The study is particularly significant because baboons are one of the best animal models for the human 【C9】______. George Ricaurte, who led the research, said that widespread【C10】______of the drug may already be【C11】______ victims of such neurological damage. "The most troubling【C12】______is that young s using Ecstasy may be 【C13】______ their risk for developing Parkinsonism as they get older." Alan Leshner, a former director of the US National Institute on Drug Abuse, said: "This study emphasizes the multi-faceted damage that Ecstasy can do【C14】______users. We"ve long known that repeated use damages serotonin brain cells. This study shows that even very【C15】______use can have long-lasting effects【C16】______ many different brain systems. It sends an important message to young people: don"t 【C17】______with your own brain." Janet Berts, the Es mother whose daughter Leah died after a single Ecstasy tablet in 1995, said: "This comes as no【C18】______. People can"t see the effects at first, and they"re in permanent denial, saying it"s not going to happen to them. But we" ll see the【C19】______ later, just as we have【C20】______moking." 【C20】