Everybody knows that cats like to sleep.They spend more than half their lives sleeping and enjoy every minute of it.Other animals have different sleeping habits，however.Horses may not look like they are asleep.But they are!Horses spend about six hours sleeping every day and they do it standing up!
   Fish also sleep every day but they have a strange（奇怪的）habit.They don't close their eyes when they are sleeping.When ducks sleep they keep one eye open and half of the brain awake.It helps them stay alert（警覺的）and watch out for dangerous animals.
   So what about humans（人類）？Well，most people sleep for about a third of their lives.The number of hours you sleep，however，has to do with your age.Most newborn（新生的）babies sleep a lot.They spend about 75% of their time sleeping every day!As you get older，you need less sleep.Children need about eleven hours and adults sleep for eight hours every nigh
   So，yes，you spend many hours a year doing nothing-sleeping in bed!
   But you're not just asleep-you're not really doing nothing.Your body and your mind relax during this time，but a lot of things happen during sleep.Dreams are one way that the mind relaxes after a busy day.A person spends about 20% of every night dreaming.That means you have about four or five dreams every night or about 1，600 dreams a year.

（1）From the passage we know that a horse

C

C

.
A．sleeps with one eye open
B．spends half of its life sleeping
C．keeps standing up when sleeping
D．doesn't close its eyes when sleeping
（2）According to the passage，how long do most new born babies sleep one day？

D

D

A．For about 12 hours.
B．For about 14 hours.
C．For about 16 hours.
D．For about 18 hours.
（3）Which animal sleeps with one eye open and half of the brain awake？

A

A

A．

B．

C．

D．

（4）What is the passage mainly about？

C

C

A．Sleeping animals.
B．Ways to sleep well.
C．Something to know about sleep.
D．How to keep healthy.
（5）Where does the passage probably come from？

B

B

A．An art book.
B．A science book.
C．A sports book.
D．A history book.