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考研
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
admin
2014-04-20
52
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. "
【B13】
选项
A、where
B、what
C、how
D、when
答案
D
解析
连词辨析题。本空所填连词引导名词从句,且由于从句的主谓结构完整,因此可判定所填连词为关系副词。依据上下文指代关系,该从句所述内容就是指上文所说的opportunity“时机”,因此可知[D]when为正确答案。依据上述分析,本题易排除[B]what,因此该词为关系代词,不符合本句句法。而[A]where和[C]how分别表示地点和方式,也不能与上文的opportunity呼应,故也应排除。
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0
考研英语一
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