Advice to "sleep on it" could be well founded, scientists say. After a good

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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【S1】______. 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【S2】______insight and problem-solving. Dr. Jan Born, a neuroscientist at the university, and his team taught volunteers two simple rules to help them【S3】______a string of numbers into a new order. There was also a third,【S4】______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【S5】______were forced to stay awake. They noticed that the group that had slept after the training were twice as【S6】______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【S7】______.
Other scientists say the【S8】______evidence supports the anecdotal suggestions that sleep can stimulate creative thinking.
Although the role of sleep in human creativity will【S9】______be a mystery, the research gives people good reason to【S10】______respect their periods of sleep.
[A] hidden [F] manageable [K] unknown
[B] experimental [G] complex [L] reminder
[C] fully [H] prevent [M] convert
[D] remainder [I] uninvented [N] improve
[E] strengthen [J] still [O] likely [br] 【S2】

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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