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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. "
【B3】
选项 A、interfere
B、prevent
C、disturb
D、obstruct
答案A
解析 动词辨析题。本题所在句介绍实验的第二个步骤。实验者将对两种声音都恐惧的老鼠分组，一半服用药物，而本空所在的定语从句则用于说明这种药物的作用。可根据第二段第二句中的“the memory-blocking drug”，可知该药物是干扰阻隔记忆的，再根据其后的介词with可确定[A]interfere“干扰”为答案。首先排除[B]prevent“防止”，意为不让某事发生，而不是对已有的事实进行干扰，故不符合题意。[C]disturb“干扰”和[D]obstruct“阻隔”虽然在意义上接近正确答案，但两者都是及物动词，不能与后文的with搭配，故也应排除。
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