Children under five have abundant energy partly because they

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问题 Children under five have abundant energy partly because they
  
If you feel fired all the time, you don’t necessarily need to go to bed earlier. The solution could be as simple as taking a five-minute afternoon nap. Children under five have an abundance of energy and one of the reasons is because they nap once or twice a day. Many sleep experts think we’re programmed to take a nap during the day, and getting back into this habit can be a solution for those who feel tired all the time. Prof. Chris Edzikosky of the Sleep Advisory and Assessment Center thinks that one can feel refreshed after just five minutes’ sleep. And research has shown that concentration and attention are improved after even a short nap. Sleep is genetically programmed in babies and it’s only as we get older that we learn to sleep for about eight hours at night and not at all during the day. But most research suggests that we are not physically designed to sleep for one long single block. Before the working day became nine to five, all western sleep patterns were more broken up. Research has shown that in the Middle Ages, people’s sleep quite often occurred in three distinct parts, a nap in the afternoon, an early evening nap and another longer sleep until dawn. So if you do find yourself feeling sleepy through the day, don’t feel you’re being lazy by giving in to sleep and having a nap. Your increased energy and alertness will make the rest of your day extra productive.

选项 A、its genes.
B、its habit.
C、its mental state.
D、its physical condition.

答案A

解析 本题考查细节理解。题干中的短语sleep pattern在原文中根本就没有出现过,但文章中有这样一句话:“Sleep is genetically programmed in babies and it’s only as we get older that we learn to sleep for about eight hours night and not at all during the day.”从上文的 genetically这个单词可以判断选项A 是正确答案。
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