二、本题共有三段短文，每段短文后面有三至四道小题，共计十道小题。每道小题都有四个选择项。找出你认为正确的答案，并把其字母填在题前的括号内。(20%)
Passage 1
Researchers have found that REM(rapid eye movement)sleep is important to human beings.Thistype of sleep generally occurs four or five times during one night of sleep,lasting five minutesto forty mimutes for each occurrence.The deeper a person's sleep becomes,the longer the periodsof rapid eye movement.
There are physical changes in the body to show that a person has changed from NREM(non-rapid eye movement)to REM sleep.Breathing becomes faster,the heart rate increases,and,as the name implies,the eyes begin to move quickly.
Accompanying these physical changes in the body is a very important characteristic of REM sleep.It is during REM sleep that a person dreams.
1.()According to the passage,how often does REM sleep occur in one night?B.Twice
C.Four or five times
D.Forty times
2.()The word “deeper”in pagragraph 1 is closest in meaning to which of the following?
A.Heavier
B.Louder
C.Stronger
D.Happier
3.()Which of the following shows that a person is NOT dreaming in his sleep?
A.His eyes begin to move.
B.His bueathing becomes faster.
C.His heart rate increases.
D.His eyes stop moving.
4.()The subject of this passage is .
A.why people sleep
B.the human need for REM sleep
C.the characteristics of REM sleep
D.physical changes in the human body
Passage 2
Eating habits change from generation to generation.Before scientists learned about vitamins and other constituents of food,such as proteins and carbohydrates(碳水化合物)，people believed in eating large quantities of food and were not concerned so much about a balanced diet.A hearty eighteenth century meal could consist of as many as twenty courses and would probably knock out many of us today!The Romans were famous for their enormous feasts and insatiable appetites.
In the year 2020 people's eating habits may be just as surprising but in a very different sort of way.With a world-wide growth in population,food production will become exclusively mechanical and scientific.There may well be an end to food as we know it today.Meals,as we know them may become a thing of the past.Food constituents and vitamins may be taken in the form of capsules(胶囊)，tablets and pills.The thought of these highly artificial food constituents replacing present day foods may not be very attractive,but they may be the answer to food shortage and world famine.
5.()According to the passage,people in the eighteenth century .
A.were stronger
B.were richer
C.had better appetites
D.believed in eating more
6.()The word “enormous”in the first paragraph is closest in meaning to .
A.delicious
B.friendly
C.attractive
D.plenty
7.()Which of the following may be the best answer to food shortage and world famine?
A.The discovery of proteins and carbohydrates.
B.The production of artificial food constituents.
C.People's concern of a balanced diet.
D.The invention of capsules,tablets and pills.
