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  3. A single night of taking the drug Ecstasy can cause serious brain damage and hasten the【B1】______of Parkinson’s disease, scienti

A single night of taking the drug Ecstasy can cause serious brain damage and hasten the【B1】______of Parkinson’s disease, scienti

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问题     A single night of taking the drug Ecstasy can cause serious brain damage and hasten the【B1】______of Parkinson’s disease, scientists say. Just two to three Ecstasy tablets-a quantity that thousands of clubbers take during raves-can permanently 【B2】______ brain cells that affect movement and【B3】______, according to American research that 【B4】______ the drug to Parkinson’ s for the first time.
    A study by a team at Johns Hopkins University in Baltimore, Maryland, 【B5】______ monkeys and baboons found that both species of primate【B6】______irreversible damage to key cells 【B7】______ dopamine neurons, which are lost in Parkinson’ s, after receiving three low doses of Ecstasy at three-hour【B8】______.
    The study is particularly significant because baboons are one of the best animal models for the human【B9】______. George Ricaurte, who led the research, said that widespread【B10】______of the drug may already be【B11】______victims of such neurological damage. "The most troubling【B12】______is that young adults using Ecstasy may be【B13】______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【B14】______users. We’ve long known that repeated use damages serotonin brain cells. This study shows that even very【B15】______use can have long-lasting effects【B16】______many different brain systems. It sends an important message to young people: don’t【B17】______with your own brain."
    Janet Betts, the Essex mother whose daughter Leah died after a single Ecstasy tablet in 1995, said: "This comes as no【B18】______. 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【B19】______later, just as we have【B20】______smoking."
【B15】
选项 A、irregular
B、sparse
C、occasional
D、insufficient
答案C
解析 考查上下文语义及形容词辨析。根据上下文可以判断出此处说的是即使偶尔使用毒品也会对大脑系统产生长久的影响，所以选C．occasional。
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