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第二节  (共5小题；每小题2分，满分10分)
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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, “  36  ” You are probably thinking, “ This weekend I’ll make up for all the sleep I have lost.”
You are not alone. 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.  37   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 routines,  38 
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 a delay of up to an hour, which means that a short lie-in at weekends is unlikely to have any big effect.   39   This means on Monday morning we sometimes struggle to get out of bed.
So, what should we do to balance out all the rest we’ve missed?  40  That’s because our brain rests more efficiently when it’s tired.   高考英语学习经验  http://www.17xuexiba.com/yy/