2011年6月英语四级阅读理解模拟题及解析(9)
2011-05-19 阅读 : 次
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2011年6月英语四级阅读理解模拟题及解析(9)
Baekeland and Hartmann report that the “short sleepers” had been more or less average in their sleep needs until the men were in their teens. But at about age 15 or so, the men voluntarily began cutting down their nightly sleep time because of pressures from school, work, and other activities. These men tended to view their nightly periods of unconsciousness as bothersome interruptions in their daily routines.
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