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  3. It happens to every college student. Every professor on campus assigns a paper the same week. Volunteer work and social activiti

It happens to every college student. Every professor on campus assigns a paper the same week. Volunteer work and social activiti

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问题     It happens to every college student. Every professor on campus assigns a paper the same week. Volunteer work and social activities fill the calendar. Before long, an assignment is due in the morning, so what else is there to do? Brew a pot of coffee and begin another of that most storied of college traditions: the all-nighter.
    Many college students have found themselves in this position. Although studying late into the early hours is a pretty well-accepted part of college life, the scientific consensus is clear—insufficient sleep is bad for a student’s performance, happiness and health.
    Sleep is one of the body’s most vital processes, affecting everything from muscle strength to memory span. Sleep increases blood flow to muscles and repairs damaged cells. A recent study indicates that college basketball players perform better on the court if they sleep at least ten hours the night before. Sleep consolidates memories and prepares the brain to perform—students who get more sleep can improve recall ability and actually do better on tests.
    How much sleep a person needs varies, but Dr. William DeMent from Stanford University says college students need over eight hours per night. With assignments piling up, many students end up constantly sleep deprived. Students accumulate a "sleep debt" that can get larger over time and can only be "paid off" by getting the amount of sleep the body needs. Naturally, a person’s body would force them to get enough sleep by making them feel sleepy. But caffeine, stimulants, pressing deadlines encourage students to ignore the body’s natural signals and go without sleep far longer than they should.
    It’s easy to get caught up in the excitement and stress of college life and to get in the habit of getting to bed later and later. But pushing bodies and schedules to their limits does not come without cost. In the short-term, sleep deprivation affects mood, mental ability and physical performance. It decreases reaction time and makes a person more easily distracted. That’s bad for test taking, and even worse for students who are driving. In the long-term, not getting enough sleep can sacrifice your health and shorten your life span by causing irritability, frustration and proneness to mistakes, associated with high blood pressure, obesity and heart failure. There are more than enough reasons to hit the sack early tonight!
It can be concluded from this passage that______.
选项 A、sleep is of great importance to college students
B、most college students refuse to go to bed early
C、college students go to bed late only occasionally
D、most colleges force students to work at night
答案A
解析 全文中没有支持选项B和D的证据，而第二段第二句讲，“开夜车”是大学生活中司空见惯的，因此否定了C项。文章的主题与睡眠不足的危害有关，说明睡眠的重要性。
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