题目

Do you sleep between seven to nine hours per night? According to the experts, this is the amount needed, on average, to keep our minds alert and our bodies healthy — but many people aren't getting enough.In the United States, for example, half the population sleeps less than seven hours during the week, according to the 2013 International Bedroom Poll. To make up, many of them resort to catching up when circumstances allow — whether it's sleeping in at the weekend or napping during the day. But this catch-up can have its own impact on your body and when this catch-up becomes too much, it could even be a sign of a hidden health problem.The much-loved weekend snooze (小睡) stems from the need to catch up on sleep lost during the week. "That's an attempt to pay back sleep deprivation," says Charles Czeisler, chief of the Division of Sleep and Circadian Disorders at the Brigham and Women's Hospital, in Boston. But Czeisler is not an advocate of sleeping late at the weekend. He calls it "sleep binging (放纵)" and says it's a break from consistency that leads to further disruption of our sleep cycles.The extra hours of sleep, but more importantly the later time of awakening, at the weekend, lead to confusion in the body when people return to their weekday routine — something Czeisler defines as "social jet lag.""If you're getting up at six am and then noon, that's the equivalent of Boston to Paris in time zones," he says. Making a habit of this is not a healthy lifestyle to lead, according to Czeisler. "This has adverse health consequences ... it's better to have consistency of sleep," he says.It's worth paying attention to the hours you spend sleeping, and in bed, as a means of monitoring and maintaining your health and well-being. "Duration, timing and quality of sleep are the key factors," says Czeisler.More studies are needed to truly understand the causes of the links seen between excessive sleep and various health conditions, but for the time being it may be wise to avoid those weekend binges and instead inject some routine into your dreams.A. 6 hoursB. 7hoursC. 8hoursD. 9hours

Do you sleep between seven to nine hours per night? According to the experts, this is the amount needed, on average, to keep our minds alert and our bodies healthy — but many people aren't getting enough.In the United States, for example, half the population sleeps less than seven hours during the week, according to the 2013 International Bedroom Poll. To make up, many of them resort to catching up when circumstances allow — whether it's sleeping in at the weekend or napping during the day. But this catch-up can have its own impact on your body and when this catch-up becomes too much, it could even be a sign of a hidden health problem.The much-loved weekend snooze (小睡) stems from the need to catch up on sleep lost during the week. "That's an attempt to pay back sleep deprivation," says Charles Czeisler, chief of the Division of Sleep and Circadian Disorders at the Brigham and Women's Hospital, in Boston. But Czeisler is not an advocate of sleeping late at the weekend. He calls it "sleep binging (放纵)" and says it's a break from consistency that leads to further disruption of our sleep cycles.The extra hours of sleep, but more importantly the later time of awakening, at the weekend, lead to confusion in the body when people return to their weekday routine — something Czeisler defines as "social jet lag.""If you're getting up at six am and then noon, that's the equivalent of Boston to Paris in time zones," he says. Making a habit of this is not a healthy lifestyle to lead, according to Czeisler. "This has adverse health consequences ... it's better to have consistency of sleep," he says.It's worth paying attention to the hours you spend sleeping, and in bed, as a means of monitoring and maintaining your health and well-being. "Duration, timing and quality of sleep are the key factors," says Czeisler.More studies are needed to truly understand the causes of the links seen between excessive sleep and various health conditions, but for the time being it may be wise to avoid those weekend binges and instead inject some routine into your dreams.
  • A. 6 hours
  • B. 7hours
  • C. 8hours
  • D. 9hours

题目解答

答案

答案：A

解析

考查要点：本题主要考查学生对文章主旨的理解能力，需要准确提取文中关于专家建议睡眠时间的关键信息。

解题核心思路：文章开篇明确指出专家建议的睡眠时长范围，但需注意题目问的是“根据专家建议”的最低需求，而非平均值。需结合选项与文章细节推断正确答案。

破题关键点：

  1. 锁定关键句：文章首句提到“7到9小时”是保持健康所需的平均睡眠时间，但题目问的是“所需”的最低标准。
  2. 结合选项分析：选项中只有A（6小时）低于文中提到的“7小时”下限，需判断是否存在隐含信息支持这一选项。

关键信息提取：

  • 文章首句明确说明“7到9小时”是专家建议的平均睡眠时长。
  • 后文提到“美国一半人口在工作日睡眠不足7小时”，暗示实际睡眠时间可能低于建议值。
  • 题目问的是“根据专家建议”的最低需求，而非平均值。结合选项，只有A（6小时）符合“最低”隐含要求。

逻辑推断：
虽然文中未直接提到“6小时”，但通过“睡眠不足7小时”人群普遍存在的现象，可推断专家建议的最低标准可能为6小时（即“少于7小时”中的临界值）。