Question

As is often the case, you are trying hard to keep your eyes open in class after a late night doing piles and piles of homework, “1.” You are probably thinking, “ This weekend I’ll make up for all the sleep I have lost.”

2.. Most people think the same way-if you stay in bed longer on Saturdays or Sundays, you will recover your missed sleep during the week.

However, this is not correct.3. Actually, researchers have just discovered that sleeping during the weekend will not do you any good, but rather make you feel more tired on Monday morning.

Our body keeps a clock inside. It tells us when to wake up in the morning and when to feel sleepy at night. But the time on our body clock can be changed once we start taking on different sleeping habits.4.. This may mean on Monday morning we sometimes struggle to get out of bed.

If we decide to get up only 20 minutes or half an hour later, it won’t matter. This is because our body clock can accommodate(顺应) a delay of up to an hour, which means that a short lie-in at weekends is unlikely to have any big effect, we needn’t worry about it at all.5.,

So, what should we do to balance and make up for all the sleep we’ve missed? Scientists say that simply eight hours of sleep would do the trick, not any longer.

A.You are not alone.

B.I need more sleep!

C.Sleep is important for everyone.

D.Sleeping is nothing like paying back money.

E.However, if we sleep longer our sleep becomes less efficient.

F.But delays of up to two hours or more can throw our body out of order.

G.This is why staying in bed for longer than usual might confuse our body clock.

Answer

1. B

2. A

3. D

4. G

5. F

【解析】

本文是一篇说明文，很多人习惯于平时熬夜，周末补觉。科学研究发现这样做是没有效果的，因为我们体内的生物钟会随着我们睡眠时间的改变而改变，周末补觉是没有用的。

1.根据横线前句“As is often the case, you are trying hard to keep your eyes open in class after a late night doing piles and piles of homework…”可知我前一天晚上熬夜到很晚，所以我需要更多的睡眠。B项“I need more sleep!”符合语境，故选择B项。

2.根据横线后句“Most people think the same way-if you stay in bed longer on Saturdays or Sundays, you will recover your missed sleep during the week.”可知很多人和你一样，都要在周末补觉。A项“You are not alone.”符合语境，故选择A项。

3.横线前一句“However, this is not correct.”告诉我们这种做法是错误的，平时缺少的睡眠是无法补回来的。D项“Sleeping is nothing like paying back money.”符合语境，故选择D项。

4.横线前一句“But the time on our body clock can be changed once we start taking on different sleeping habits.”告诉我们党我们有不同的睡眠习惯的时候，我们体内的生物钟会发生改变。恰好解释了G项“This is why staying in bed for longer than usual might confuse our body clock.”，故选择G项。

5.根据横线前一句“This is because our body clock can accommodate(顺应) a delay of up to an hour, which means that a short lie-in at weekends is unlikely to have any big effect, we needn’t worry about it at all.”可知当我推迟一个小时睡眠的时候，我们的生物钟会顺应做出调整，不会有太大的影响。但是推迟的时间不能太长，推迟的时间太长会对我们的睡眠生物钟产生不好的影响。F项“But delays of up to two hours or more can throw our body out of order.”符合语境，故选择F项。