2. 外语
  3. Getting a good night’s sleep has long been known to consolidate the day’s memories, moving them from short-term storage into lon

Getting a good night’s sleep has long been known to consolidate the day’s memories, moving them from short-term storage into lon

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问题     Getting a good night’s sleep has long been known to consolidate the day’s memories, moving them from short-term storage into long-term holding, but new research shows that it’s not automatic. A(n) 【C1】______of sleep is helpful only【C2】______you know a test is coming or, more【C3】______, if you explicitly tell yourself you’ll need the information in the future. And we can put it in other【C4】______, don’t expect eight hours of shut-eye to help you on a pop【C5】______
    In an elegant【C6】______of experiments, scientists at the University of Luebeck in Germany tested memory by having【C7】______learn 40 word pairs, or the【C8】______of 15 cards in a concentration-type game plus a【C9】______of finger taps. Sleep【C10】______memory only in those who had been told they’d be tested 10 hours【C11】______not in those for whom the test came as a(n) 【C12】______. says a report in the Journal of Neuroscience. "Merely expecting that a memory will be used in a test determines whether sleep【C13】______its consolidation," says Lubeck’s Jan Born.
    The new research is the first to show how sleep 【C14】______its memory magic. EEGs(脑电图)found that the "test is coming" group spent【C15】______time in deep, slow-wave sleep than did the group not【C16】______a test. Slow electrical waves act【C17】______a replay button on the recorder,【C18】______the hippocampus(海马状突起)to reactivate new memories and synchronizing the neocortex(大脑新皮层)so that it accepts them into long-term storage. This【C19】______group also had more "sleep spindles(睡眠梭形波)", bursts of electrical activity that prime networks in the cortex to store memories arriving from the hippocampus and to【C20】______them into existing knowledge, which makes retrieval easier.
【C2】
选项 A、if
B、before
C、after
D、because
答案A
解析 连词辨析题。这里表达的是前提条件，only if表示“只有在……情况下才……”，if"如果"符合题意。
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