U. S. researchers suggest sleeping can help us remember things we have just learnt. A team from Northwestern University【C1】_____

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问题     U. S. researchers suggest sleeping can help us remember things we have just learnt. A team from Northwestern University【C1】______that a 90-minute nap(小睡)can help people learn a new skill. The【C2】______on their research is published in the June edition of the journal Nature. The scientists say: "Information acquired during waking can be reactivated(重新激活)during sleep,【C3】______memory stabilization. " Test volunteers practiced musical tunes before and after a short sleep.【C4】______the nap, the researchers played one of the tunes the volunteers had practiced. The team found that the participants made【C5】______errors when playing the tune that had been played while they slept.
    Study co-author Dr Pau J. Reuber points out the research might not work【C6】______learning a foreign language while you sleep. He said: "The critical【C7】______is that our research shows that memory is strengthened for something you’ve already learned. " He added: "Rather than learning something【C8】______in your sleep, we’re talking about enhancing an existing memory by reactivating information recently acquired. "【C9】______, Dr Reuber did say there were possibilities for language learners; "If you were learning【C10】______to speak in a foreign language during the day, for example, and then tried to reactivate those memories during sleep, perhaps you might enhance your learning," he said.
【C10】

选项 A、when
B、where
C、how
D、why

答案C

解析 由句中空格前后的动词were learning和不定式宾语to speak in a foreign language的意思可知,此处填入疑问副词how后句子相关部分语意合理,were learning how tospeak in a language意为“学习如何说外语”。其他几个疑问副词when(何时)、where(何地)、why(为何)均不能与句子相关部分构成合理的搭配。
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