2. 外语
  3. Advice to "sleep on it" could be well founded, scientists say. After a good night’s sleep, a problem that seemed insurmountable(

Advice to "sleep on it" could be well founded, scientists say. After a good night’s sleep, a problem that seemed insurmountable(

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问题     Advice to "sleep on it" could be well founded, scientists say. After a good night’s sleep, a problem that seemed insurmountable(不能克服的)the night before can often appear more【C1】______. although the evidence until now has been anecdotal(轶事的).
    But researchers at the University of Luebek in Germany have designed an experiment that shows a good night’s sleep can【C2】______insight and problem-solving. Dr. Jan Born, a neuroscientist at the university, and his team taught volunteers two simple rules to help them【C3】______a string of numbers into a new order. There was also a third,【C4】______rule, which could help them increase their speed in solving the problem. The researchers divided the volunteers into two groups: half were allowed to sleep after the training while the【C5】______were forced to stay awake. They noticed that the group that had slept after the training were twice as【C6】______to figure out the third rule as the other group.
    "You have a memory representation in your brain of the problem you want to solve, and then you sleep. Sleep can act on the problem," Born said in a telephone interview. But he also admitted that how restructuring of memories occurs or what governs it is still【C7】______.
    Other scientists say the【C8】______evidence supports the anecdotal suggestions that sleep can stimulate creative thinking.
    Although the role of sleep in human creativity will【C9】______be a mystery, the research gives people good reason to【C10】______respect their periods of sleep.
A)hidden I)uninvented
B)experimental J)still
C)fully K)unknown
D)remainder L)reminder
E)strengthen M)convert
F)manageable N)improve
G)complex O)likely
H)prevent
【C2】
选项
答案N
解析 由空前的good和can可知，本空应填一表积极意义的原形动词，故E)strengthen、N)improve入选。后面能接insight and problem—solving(洞察力和问题解决能力)的动词是improve而不是strengthen，故答案为N)improve。这里说的是好睡眠能提高人的洞察力和解决问题的能力。
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