摘要: One major of stress is homework.

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  Do you know why you sleep? You may think it’s because you’re tired.Or perhaps you’ve been told sleep is good for you.Yet no one knows exactly why or how people sleep.

  Until the early 1950s, most scientists thought the body and brain rested during sleep.Then a scientist watched people sleep.He noticed that during periods of between 5 and 30 minutes each, sleepers’ eyes made rapid movements, as if they were watching something.He called these periods REM sleep, for Rapid Eye Movement.Periods when sleepers’ eyes did not move he called non-REM sleep.

  Whenever the scientist woke people during REM sleep, they were having vivid dreams.Measurements showed that sleepers’ pulses(脉搏)went up quickly during REM sleep.Their breathing, heartbeat, and the blood going to the brain also increased.Far from being a time of rest, REM sleep is a time when the body is hard at work.Scientists still don’t know the reason for this.Some believe REM sleep makes learning easier.Babies spend a lot of time in REM sleep.Because of this, some scientists believe that REM sleep helps the brain grow.Others think REM sleep is a time for the brain to empty the day’s garbage.

  One thing all the scientists agree on is that sleep is necessary.Without enough sleep, people make mistakes.Most major car accidents happen during the early morning hours, when people are sleepiest.

(1)

During REM sleep, a person’s breathing and heartbeat _________.

[  ]

A.

stop

B.

increase

C.

decrease

D.

stay the same

(2)

Which word in paragraph(段落)3 means “colorful and lively”?

[  ]

A.

easier

B.

empty

C.

vivid

D.

quickly

(3)

Which paragraph tells what happens when people don’t get enough sleep?

[  ]

A.

1

B.

2

C.

3

D.

4

(4)

What is the main idea of the article?

[  ]

A.

REM sleep helps the brain grow.

B.

REM sleep has been watched and recorded by scientists.

C.

REM sleep is a time to empty the day’s garbage.

D.

REM sleep is an active time when the body is hard at work.

(5)

You can decide from the article that REM sleep _________.

[  ]

A.

has a restful effect on people

B.

can be avoided with lots of sleep

C.

is something that all people experience

D.

is something that all scientists agree on

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完形填空:

  Tea, the most popular drink in the world, was invented by accident.  1   an ancient Chinese legend, the emperor Shen Nong   2   tea when he was boiling drinking water over an open fire.Some leaves from a nearby bush fell into the water and   3   there for some time.The emperor noticed that the leaves in the water produced a   4   smell.Later he decided to   5   the hot mixture.It was quite delicious.And   6  , one of the world’s favorite drinks was invented.

  China is home of tea, which has more than 4,000 years of   7  .People in China drink tea daily.  8   the three major drinks-tea, coffee and cocoa, tea is drunk by   9   people in the world.Tea from China,   10   silk and porcelain(瓷器), began to be known by the world over a thousand years ago and has been an important Chinese export(出口产品)  11  .

  Tea leaves are grown   12   in the south area of the Changjiang River, in the provinces of Zhejiang, Jiangxi and Fujian.Longjing, Wulong, Pu’er and Tieguanyin are all   13   kinds of tea.

  Over the past centuries, Chinese people have developed their special tea culture, which   14   tea planting, tea-leaf picking, tea making and so on.Tea is also a popular   15   which is often mentioned in dances, songs, poems and novels.

(1)

[  ]

A.

Thanks to

B.

According to

C.

Because of

D.

As for

(2)

[  ]

A.

invented

B.

found

C.

discovered

D.

tried

(3)

[  ]

A.

heated

B.

remained

C.

changed

D.

burnt

(4)

[  ]

A.

strange

B.

strong

C.

pleasant

D.

terrible

(5)

[  ]

A.

taste

B.

smell

C.

eat

D.

feel

(6)

[  ]

A.

in the way

B.

on the way

C.

by the way

D.

in this way

(7)

[  ]

A.

geography

B.

history

C.

dream

D.

life

(8)

[  ]

A.

In

B.

From

C.

Of

D.

By

(9)

[  ]

A.

the number of

B.

a number of

C.

a large number of

D.

the largest number of

(10)

[  ]

A.

together with

B.

as well

C.

except for

D.

i1nstead of

(11)

[  ]

A.

at that time

B.

from now on

C.

since then

D.

since now

(12)

[  ]

A.

mainly

B.

nearly

C.

only

D.

simply

(13)

[  ]

A.

interesting

B.

embarrassing

C.

similar

D.

famous

(14)

[  ]

A.

divides

B.

adds

C.

creates

D.

includes

(15)

[  ]

A.

story

B.

topic

C.

writing

D.

music

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