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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. "
【B18】
选项 A、evidence
B、contradiction
C、potential
D、tendency
答案C
解析 名词辨析题。前一分句提到名为普萘洛尔的记忆阻隔药物已经开始进行人体试验，它的原理是阻碍神经传递素的活动。文章在此处提到已有的记忆阻隔药物，就是要与U0126进行比较，这从后文的greaterprecision也可看出。但U0126的作用究竟如何，前后文一直都使用may或might等推测性的语言，因此选择potential，表示与其他药物相比，本文所提到的药物“具有更准确消除记忆的发展潜质或可能性”，故[C]为答案。首先排除[A]evidence“证据”和[B]contradiction“矛盾”，因为文章并没有讨论任何证据或指出有什么矛盾。[D]tendency表示“趋势”，主要说明自然呈现的倾向，且其后应搭配介词to或toward，故也不合题意，应排除。
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