四、还原信息(4分)
Do you know the reason why we feel tired in the middle of a class?Maybe you would say it
is because the teacher's class is boring.1. Perhaps this is something you have not paid
enough attention to or not yet noticed.
Purpose of sleep
Why do we need sleep?Sleep helps our body heal(修复),grow and stay healthy.It also
gives us energy,so we can be active all day.
Sleep time
Enough sleep is important to us.New-born babies sleep 20-22 hours a day.Children need
10-12 hours of sleep a day.Teenagers need 8-10 hours of sleep a day.Grown-ups usually need
6-8 hours of sleep to keep active.2. That is why old people sleep less than young
people.
Interesting facts
Almost everyone has their dreams while they sleep,but not all of them can tell their
dreams clearly when they wake up.3. More surprisingly,some may even get up in
their dreams and walk around.This is called “ sleepwalking ".
4.
It's not just people that love to snooze(打盹).In fact,many animals have surprising
sleeping habits.Some animals,such as bears and hedgehogs,sleep all through win tter.The
swift is a very fast bird that can sleep while it flies ! Cute koalas sleep around 18 hours a day.
A.Sleepy animals B.Clever animals
C.Some people talk in their dreams. D.Some people never dream while they sleep.
E.The older you get,the less sleep you will need.
F.However,the real reason is probably that you don't have enough sleep.