单选题 Sleep plays a major role in preparing the body for an alert and productive tomorrow. But sleep is not a period of inactivity. The sleeping brain is highly active at various times during the night, performing numerous "house keeping tasks". These keep us alive and aid our ability to think and remember. Sleep also energizes the body and brain. Most people spend one-third of their lives sleeping and this will affect the other two-thirds in terms of alertness, energy, moods, body weight, perception, memory, thinking, reaction time, productivity and performance.
To limit sleep means our health and daytime potential are significantly reduced. So, good sleep strategies are essential in order to feel energized day after day. There is no strategy which works for everyone, so each person needs to experiment. One important thing is that you shouldn't worry too much if you go a few nights without a lot of sleep. It won't ruin your life. On any given night, one in four people can't sleep properly and everyone suffers from a lack of sleep at some time.
How does one minimize this problem? It is really quite simple. The first thing you must do is to reduce stress as much as possible. Stress is part of everyday life and, while we can never be entirely without stress, it can be managed. This means taking control of your life and focusing on what is important. One sleeping strategy is to sit in a comfortable position, close your eyes and relax all your muscles, breathing easily through your nose. Continue this for ten to twenty minutes. This should help you reduce stress and sleep better. Or, you can try getting plenty of exercise, because a tired body is likely to sleep better.

单选题 According to the article, sleep is important because______.
【正确答案】 C
【答案解析】[解析] 细节题。由第一段第一句可知睡眠会在我们醒来时使我们感到精力充沛。所以应选C。
单选题 Methods of getting enough sleep______.
【正确答案】 C
【答案解析】[解析] 细节题。由第二段第三句可知睡眠策略是因人而异的。所以应选C。
单选题 According to the article, being unable to sleep______.
【正确答案】 B
【答案解析】[解析] 细节题。由第二段最后一句可知每个人都会有失眠的经历。所以应选B。
单选题 A simple strategy to sleep better is to______.
【正确答案】 B
【答案解析】[解析] 细节题。由第三段二、三句可知你必须做的第一点就是尽可能地减少压力。所以应选B。
单选题 After a lot of physical exercise, ______.
【正确答案】 C
【答案解析】[解析] 推断题。文章最后一句指出疲劳的身体可能睡得更好。因此可推断出大量运动后会睡得更好。所以应选C。