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How much sleep does a person need？【31】the physiological bases of the need for sleep remain

conjectural (猜想), rendering conclusive answers to this question impossible, much evidence has been gathered on how much sleep people do in fact obtain. Perhaps the most important conclusion to be【32】from this evidence is【33】there is great variability among individuals in total sleep time. For adults,【34】between six and nine hours of sleep as a nightly average is not unusual, and 7.5 hours probably best expresses the norm. Such norms, of course, forms inevitably vary with the criteria of sleep employed, The most【35】and reliable figures on sleep time, including those cited here, come from studies in sleep laboratories, where EEG criteria are employed.

【36】consistently has been associated with the varying amount, quality, and pattern of electrophysiologically defined sleep. The newborn infant may spend an average of about 16 hours of each 24-hour period in sleep,【37】the sleep time drops sharply; by two years of age, it may【38】from nine to 12 hours. Decreases to approximately six hours have been observed among the elderly.

【39】will be discussed from below, EEG sleep studies have indicated that sleep can be considered to consist of several different stages. Developmental changes in the relative proportion of sleep time【40】in these sleep stages are as striking as age-related changes in total sleep time.

(31)

A．As

B．Despite

C．While

D．Whether

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更多“How much sleep does a person n…”相关的问题

第1题

How much does it cost to hire a multi-media guide？

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第2题

—________________.

— It costs us ten thousand dollars.

A.How many does the printing of the annual report cost.

B.What does the printing of the annual report make.

C.How much does the printing of the annual report cost.

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第3题

How much does Sagan ,think America should spend on Space Exploration？A．More than she does

How much does Sagan ,think America should spend on Space Exploration？

A．More than she does at present.

B．Less than she does at present.

C．As much as England did in the sixteenth century.

D．All of her gross national income.

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第4题

How much interest per year does the bank currently pay？A．2.5 percent.B．4 percent.C．7 perce

How much interest per year does the bank currently pay？

A．2.5 percent.

B．4 percent.

C．7 percent.

D．It's hard to say.

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第5题

Could you tell me （） to fly from Chicago to New York？

A．it costs how much

B．how much does it cost

C．how much costs it

D．how much it costs

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第6题

Alice can make 20 dollars per hour. Bob earns 40% more than Alice, and Carlos earns 25%

A. How much does Carlos earn per hour？（）

B.18$

C.21$

D.28$

E.35$

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第7题

There is no creature that does not need sleep or complete rest every day.If you want to kn

There is no creature that does not need sleep or complete rest every day.

If you want to know why, just try going without sleep for a long period of time. You will discover that your mind and body would become too tired to work properly. You would become irritable and find it hard to think clearly or concentrate on your work. So sleep is quite simply the time when the cells of your body recover from the work of the day and build up supplies of energy for the next period of activity.

One of the things we all know about sleep is that we are unconscious in sleep. We do not know what is going on around us. But that doesn't mean the body stops all activity. The important organs continue to work during sleep, but most of the body functions are slowed down.

For example, our breathing becomes slower and deeper. The heart beats more slowly, and the blood pressure is lower. Our arms and legs become limp(柔软的) and muscles are at rest. It would be impossible for our body to relax to such an extent if we were awake. So sleep does for us what the most quiet rest can not do.

Your body temperature becomes lower when you are asleep, which is the reason people go to sleep under some kind of covers. And even though you are unconscious, many of your reflexes(习惯性思维) still work. For instance, if someone tickles(使觉得痒) your foot, you will put it away in your sleep, or even brush a fly from your forehead. You do these things without knowing it.

If you don't have as much sleep as your body needs, you will ______.

A．work properly

B．think clearly

C．keep your attention on your work

D．easily get angry

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第8题

Although international travel is usually an （1 ) and pleasant experience, travellers

Although international travel is usually an (1 ) and pleasant experience, travellers should take steps to ensure that their health does not suffer either (2 ) their time (2 ) the air or (2 ) their time abroad. Before you go, check with your doctor or local travel clinic (3 ) injections are necessary for the areas you are travelling (4 ) . Allow sufficient time to have these injections before you (5 ) because they may take time to become effective. Be sure that the information on health is up-to-date. Check on the Internet if you are not sure. Don't go to bed late the day (6 ) you fly. Your body has a natural daily sleep pattern. It takes time to adjust to a new time zone. There are many different (7 ) of jet lag: you may not be able to sleep, you may not want to eat or you may feel sick and tired. You may not be able to concentrate for some days after you arrive. There are several things you can do to (8 ) the effects of jet lag: - Do your (9 ) to relax during the flight- Sleep as much as you can on the flight. Use a mild sleeping pill if necessary- Drink as much water as you can- Don't drink alcohol and caffeine- Take mild sleeping pills (10 ) the first few days in the new time zone if you need them.

(1).A、excited

B、exciting

C、unexcited

D、unexciting

(2).A、of…on…of

B、of…in…of

C、from…on…from

D、from…in…from

(3).A、where

B、- (不填)

C、which

D、that

(4).A、- (不填)

B、in

C、to

D、at

(5).A、will leave

B、is leaving

C、leave

D、have left

(6).A、after

B、in

C、on

D、before

(7).A、effects

B、effect

C、affect

D、affects

(8).A、short

B、shorten

C、less

D、lessen

(9).A、good

B、better

C、best

D、most

(10).A、at

B、for

C、of

D、on

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第9题

Xiaoyan: I have most of the things I need.We don' t need to buy any rice, and we d

on't need any peas.

Mary: We need some oranges.How many do we need to buy？

Xiaoyan: Four are enough.And we need some cream.

Mary: How much cream do we need to buy for four people？

Xiaoyan: Two cartons？ Shall we get a melon and some wine？ And 1 haven' t got any coffee.

Mary: OK.And lychees.Two tins？

Xiaoyan: How many lychees do you get in a tin？

Mary: 1 don' t know.Let' s get a big tin.We also need some mineral water.

Xiaoyan: And the prawns.How many prawns？

Mary: One big packet will do.I also need to get some vegetables for next week potatoes, carrots, onions, and a cabbage 1 think.There' s a little greengrocer's along the road.Why don't we go there first？

1、How many oranges does Xiaoyan want to buy？ ()

A.One.

B.A kilo.

C.Four.

2、Do they need any cream？ ()

A.Yes, they do.

B.No , they don't.

C.The text does not tell us

3、How many prawns do they want to buy？ ()

A.A packet.

B.Two packets.

C.Three packets.

4、Who would like to have some vegetables？ ()

A.Xiaoyan.

B.Mary

C.Shopkeeper.

5、Which is not included (包括) in the shopping list？ ()

A.Rice and peas.

B.Potatoes and coffee.

C.Melons and wine.

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第10题

根据以下内容回答题:Man has invented ways to keep walqTl，but how do animals defend themselv

es？They can not reason in the sense that a man can，but nature has taken care of the animal kingdom by providing animals with special instincts．One of these instincts is known as hibernation（冬眠）． “Sleeping like a dormouse”is not only a common saying but is a reality．When winter comes，the dormouse and other hibernating animals have reached a well-nourished state．They eat very well in warmer days laying downy fat in the tissues of their bodies and during hiberna- tion this keeps them alive．Safe in their nests，or burrows，they sleep soundly until the warmth of spring arrives． Bats，tortoises，snakes，frogs，even insects like butterflies，hibernate more or less eom-pletely．Some，like the squirrels，sleep during coldest weather but are roused by a waYnl spells．During hibernation，the temperature of an animal’S body drops drastically．Breathing and heart．beats almost cease． Another instinctive method of avoiding intense cold is to escape by means of migration．Wild swans，seagulls，swallows and cuckoos are a few of the very many kinds of birds which fly thousands of miles，twice a year，to avoid cold．Many animals，especially those of the Arctic regions，have summer and winter quarters．The Arctic deer of North America；as well as the reindeer of Europe，move southward towards the forests when winter approaches．They return to the northern area when the warmth of spring begins to be sensed． There are animals which do not attempt to leave at the first sign of winter cold．Their in—stinctive means of defence is to dig out a deep burrow，made soft and waYin by padding out with straw，1eaves，moss and fur．In it they have a“secret place”containing food which they hope will last the winter through!Animals which faU into this clhss include the Arctic fox，the rabbit ana the ermine，and the little field-mice．

How does the dormouse defend itself against cold in winter？

A.It moves about to keep warlTl．

B.It grows thicker fur．

C.It sleeps continuously．

D.It goes to warmer areas.

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第11题

John James Audubon was born in 1785 and died in 1851, but his name is still spoken every d

ay. Andubon was a scientist who loved nature. He wanted to show people the importance of nature in their lives. He was especially interested in birds, and painted many pictures of them.

In 1905, the National Audubon Society was formed by people who were also interested in birds and wanted to continue Audubon's nature studies. Even now, when people think of the Audubon Society, they usually think of birds. But the society does other things besides watching birds.

The members of the Society try to improve the environment as much as they can. They have helped pass many laws that protect birds and animals, and people, too. They taught young people how to protect their environment. They try to make their own communities cleaner, better places to live in.

John James Audubon knew that nature was important, He did not know how important his work would become.

Audubon ______.

A．was not famous 130 years ago

B．is still famous now

C．was famous 200 years ago

D．is not famous now

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