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  3. Researchers led by New York University neuroscientist Joseph LeDoux recently claimed to be the first scientists to erase a singl

Researchers led by New York University neuroscientist Joseph LeDoux recently claimed to be the first scientists to erase a singl

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问题     Researchers led by New York University neuroscientist Joseph LeDoux recently claimed to be the first scientists to erase a single memory. Working with rats, LeDoux’s team first【B1】______the animals to fear both a beep and a siren【B2】______giving them an electric shock every time either of the tones sounded. Then LeDoux gave half the rats the drug U0126, which is known to【B3】______with memory storage, and replayed the beep【B4】______electric shocks.
    A day later, when LeDoux【B5】______back both tones to the rats, the animals that hadn’t been given the drug were still fearful of both sounds.【B6】______the rats that had been given the memory-blocking drug weren’t【B7】______of the beep, which they had last heard while【B8】______the influence of U0126.
    【B9】______how U0126 exerts its amnesiac effect is【B10】______, but it may block the synthesis of proteins that help strengthen【B11】______between neurons and establish memories. The opportunity for erasure【B12】______during the act of retrieving a memory, because that’s【B13】______the memory is being updated and【B14】______again for long-term storage. " Only those memories that are activated are【B15】______," LeDoux says.
    Drugs like U0126 may someday【B16】______sufferers of traumatic memories. A small group of human studies have been done on a drug called propranolol, which blocks the action of stress neurotransmitters that help【B17】______memories in the brain, but LeDoux’s work shows the【B18】______for greater precision. " You might be able to【B19】______the traumatic impact of memories in people," says LeDoux. " The good news is you wouldn’t be【B20】______off their memory bank. "
【B19】
选项 A、suspend
B、explore
C、maintain
D、reduce
答案D
解析 动词辨析题。文章通篇在讨论新型的记忆阻隔药物，本段也指出其目的在于帮助受创伤性记忆困扰的人，对于这种记忆必然是希望它的影响减少到最低，故本句的意义应是“你可以减少人们头脑中创伤性记忆的影响”，故[D]reduce“减少”为正确答案。首先排除[C]maintain“保持”，因为这与研究记忆阻隔药物的初衷恰恰相反。[B]explore“探究”，本文的主题是阻隔创伤性记忆，故“探究记忆的影响”显然偏离主题。而[A]suspend表示“暂停”，本文提及的药物是要消除或减轻创伤记忆的影响，而不是仅仅暂时停止，故[A]也应排除。
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