The weight-loss world is full of assertions①, rarely proved, that some pill can help you “burn calories while you sleep.” But a recent Dutch study reports that it can be done – simply by eating more lean protein②.

Researchers report for the first time that consuming nearly a third of daily calories as lean protein – for example, lean meats without the skin – speeds up a person’s metabolism③ during sleep and that higher protein intake increases the burning of calories and fat during the day. Plus, when the study’s participants, who were all women of healthy weight, ate more protein, they felt fuller, more satisfied and less hungry than when they consumed a diet with the amount of protein, about 10 percent of calories.

The findings suggest that adding lean protein to your daily food “enables you to reach the same level of satiety④ that you are used to with about 80 percent of your normal energy intake,” notes Margriet Westerterp-Plantenga. “That means you can eat about 20 percent less and still have the same satiety.”

What gives protein its caloric edge? It’s more difficult for the body to metabolize protein than either fat or carbohydrates⑤. The body also doesn’t store protein as efficiently as it does carbohydrates or fat. So protein is more likely to be burned and that in turn requires more oxygen and helps you feel satisfied in the hours after eating.

But the latest findings don’t mean it’s time to dust off those high-protein diet books. The current study limited fat to about 30 percent of daily calories, and included 40 percent of calories as healthy carbohydrates, including fruit and vegetables. For example, lunch included bread, soy milk, fruit yogurt, tuna in water, tomatoes, cucumbers, feta cheese and salad dressing.

1. According the first paragraph, we know that ______.

  A. there’re few studies on weight-loss in the world

B. many studies on weight-loss only cheat customers

C. only few studies are useful for weight-loss

D. there’re few studies about lean protein

2. According to the passage, lean protein can help burn calories while you sleep because ______.

  A. it can slow down a person’s metabolism       B. it’s difficult for the body to metabolize

  C. it will not make you feel full                D. it’s easy to be stored in the body

3. The underlined phrase “dust off” in the last paragraph means ______.

   A. get rid of      B. put away      C. get ready to rewrite      D. get ready to reuse

4. The passage is mainly to tell readers ______.

  A. there is a good diet for weight-losers

B. you can burn your calories in your sleep

  C. high-protein diet books will be popular

D. choosing right food is of great use

It’s nearly noon on a Saturday and you can’t believe it: your teenager is still in bed, sleeping away. But before you wake him up---mumbling to yourself that you can’t believe what a lazybones he is---you should know that he probably needs all the zzzs he can get.
As much as nine hours of sleep a night, in fact. Furthermore, teens’ circadian rhythms (i.e., processes that occur once a day) mean that young people would rather stay up past midnight and rise after 9 a.m. The result? Many teens stay up late, drag themselves out of bed early for school and try to make up the sleep debt on the weekends---or in class!
“There’s a biological reason why teens stay up late and want to sleep late,” says Dr. Stan Kutcher, the Sun Life Chair of Adolescent Mental Health at Dalhousie University in Halifax. “Their natural sleep-wake cycle changes as part of the maturation process. And because of changes in their social activities, recovering from sleep debt is more problematic.”
Teens need extra sleep for several reasons. First, their brains are changing. “The brain is reorganizing itself, laying down new pathways. What we’re seeing is a relationship between brain redevelopment and an increased need for sleep,” says Kutcher. As well, growth hormones are released during sleep, so adequate sleep is crucial for adolescents’ physical development. In addition, everything adolescents have learned in school that day is being processed and locked into long-term memory during sleep. Sufficient sleep also plays a key role in overall physical health. The immune system, for example, needs deep sleep to become and remain robust(healthy).
Staying up late on school nights means that, on average, teens get between six and a half and seven hours of sleep a night---about two hours less than they need. As a result, many either doze off in class or have trouble concentrating. Some of the behavioural problems and irritability in teens can be linked directly to sleep deprivation(损失), Kutcher says.
Then there’s the breakfast issue. Dr. Carlyle Smith, a sleep researcher and a psychology professor at Trent University in Peterborough, Ont., adds that many teens simply cannot tolerate food when they first wake up, so skipping breakfast becomes another factor in reduced alertness in class. The most obvious solution to the teen sleep problem is to have school start later in the day, but initiatives(积极性) toward this across the country have gone nowhere, Smith says, mainly because of costs and resistance from school boards and teachers.
So for now, just sympathize with your teens. Encourage them to go to bed, if not early, then at least at a regular time, so they won’t develop insomnia from erratic(不稳定的) schedules. Warn them not to have too many caffeinated drinks before bed. And don’t let sleeping away the weekend become an issue to fight over. Schedule family activities to take place later in the day on weekends and let them sleep in. “If you want your kids to grow and remember stuff, let them sleep,” says Smith. “It’s not laziness. Their brains are working really, really hard.”
【小题1】The word “zzzs” (Paragraph 1) most probably means __________.

A．food

B．sleep

C．energy

D．blame

【小题2】What causes teenagers to be less sleepy late at night and more sleepy early in the morning?

A．Caffeinated drinks.

B．Too much family activities.

C．Circadian rhythms.

D．Too much homework.

【小题3】How many reason why teens need extra sleep are mentioned in Paragraph 4?

A．Three.

B．Four.

C．Five.

D．Six.

【小题4】One of the reasons why many teenagers fail to have better performances in class is that __________.

A．teenagers go to bed early and sleep late

B．teenagers stay up late and get up late

C．teenagers participate in too many social activities at night

D．teenagers skip breakfast because of sleeping in

【小题5】The author wrote this article to __________.

A．advise parents to let sleeping teenagers lie

B．explain why teenagers often sleep late

C．state schools should start late in the day

D．warn teenagers not to drink coffee before bed

If you ask some people, “How did you learn English so well?” you may get a surprising answer: “In my sleep!”

These are people who have taken part in one of the recent experiments (实验) to test “the learn while you sleep” method (方法), which is now being tried in several countries, and with several subjects. English is among them.

Scientists say that this sleep study method greatly speeds language learning. They say that the ordinary person can learn two or three times as much during sleep as in the same period during the day—and this does not affect (影响) his rest in any way. However, sleep teaching will only put into your head what you have studied already while you are awake.

In one experiment, ten lessons were broadcast over the radio for two weeks. Each lesson lasted twelve hours — from 8 p.m. to 8 a.m. The first three hours of English grammar and vocabulary (词汇) were given with the students awake. At 11 p.m. a lullaby (催眠曲) was broadcast to send the student to sleep and for the next three hours the radio in a soft and low voice broadcast the lesson again into his sleeping ears. At 2 a.m. a sharp noise was sent over the radio to wake the sleeping student up for a few minutes to go over the lesson. The soft music sent him back to rest again while the radio went on. At 5 o’clock his sleep ended and he had to go through the lesson again for three hours before breakfast.

1.In the experiment, lessons were given____ .

A．in the night time	B．after lullabies were broadcast
C．while the student was awake	D．all through the twelve hours

2.Before each lesson finishes, the student has to____ .

A．get up and take breakfast

B．be woken up by a loud voice

C．listen to the lesson again in sleep

D．review (复习) the lesson by himself

3.The sleep study method is being tried in many countries to teach____ .

A．the English language	B．grammar and vocabulary
C．a number of subjects	D．foreign languages

 

A dream is made up of a series of mind?pictures that form during sleep.The people and actions in these pictures seem real to the person who is dreaming.?

Dreams may be influenced(影响) by different things that are present during sleep.If a person is cold,he may dream that he is out in a snowstorm.Worries or anger may also influence the content of a dream.?

Some people think that they seldom dream,other people are quite sure that they do not dream at all.Studies of human sleep have shown,though,that everyone dreams every night.If a person thinks he does not dream,it is because he does not remember dreaming when he wakes up.Usually,a person may dream three to seven times for a total of one to two hours of dreaming every night.?

Perhaps you are wondering just how research workers can be sure that a person is dreaming.The story behind the discovery is an interesting one.?

During their research studies of human sleep,Dr.Kleitman and his assistant noticed that a person sleeping made sudden eye movements.These movements occurred at least several times a night.When a sleeper was awakened during these periods of eye movement it was learned that he had been dreaming.In most cases,the dreamer could then recall(回忆) his dream.The person's eye movements,scientists believe,were caused by the movements of his eyes as he followed the events of the dream.?

Not only does everyone dream,but it seems that we all need to dream.One theory is that dreaming gives us a chance to escape from the rules of our real world.In dreams we can see our wishes come true.We can be rich,powerful,and successful.?

　　Another theory is that in our dream we are trying to work out problems that have troubled us during waking moments.?

　　Whatever the explanation is,we all do dream,and dreaming is necessary and important to us.?

1.According to the selection,the research studies of human sleep show_____.?

A.few people dream at night?

B.some people dream three times every night?

C.some people may dream all the time during sleep?

D.everyone dreams several times every night?

2.According to the research studies,you may dream of a fire-engine________.?

A.when your alarm clock is ringing?

B.when you feel hungry?

C.when you are cold?

D.when you are ill?

3.According to the selection,you can discover what a sleeping person is dreaming of by _____.?

A.watching him (her) closely?

B.waking him(her) up when he(she) makes sudden eye movements?

C.watching his(her) eye movements?

D.talking to him while he (she) is sleeping?

4.Dreaming is important to us_______.?

A.because scientists help us in our dreams?

B.because we can relax and enjoy a care free life in our dreams?

C.because we can have a good rest?

D.because we can make discoveries in our dreams?

Many psychologists in the early twentieth century believed that humans use only 10 percent of their brains, and even the great Albert Einstein once wrote that most people use only a small portion of the grey matter between their ears. It’s a theory that has often been put forward in television documentaries; magazines, advertisements and books over the past century.
But nearly all scientists now agree the 10 percent theory is completely unfounded. In fact, they question how this figure was ever arrived at in the first place and what areas of the brain are supposed to be unneeded. The theory supposes that if 90 percent of the brain were removed, a person would Still be able to function normally, while in reality it is known that damage to even a small area of the brain can result in extremely serious physical injury different activities and that many areas of the brain are used at the same time for some complex activities or thought processes.
Throughout the course of one day, most .areas of the brain are active at some time, even during sleep. The 10 percent theory suggests that certain areas o’ the brain are not used, but scans slow activities throughout the entire brain and not in any separate part. The final argument against the 10 percent theory is the fact that doctors carefully map the brain before removing brain cancers so that they don’t affect other essential areas.
From an evolutionary point of view, it’s highly unlikely butt our comparatively larger brains would have evolved from our ancestors if the extra areas were not needed. In fact, there is absolutely no evidence support the 10 percent theory.
【小题1】How did the 10 percent theory get such widespread popularity?

A．It was promoted in various types of copular media.

B．Albert Einstein argued strongly in support.

C．It was proven in scientific research.

D．Few people could prove it wrong.

【小题2】The underlined word "unfounded" is chest in meaning to _________.

A．undiscovered

B．unproven

C．unknown

D．unnecessary

【小题3】Which of the following is true according to the writer?

A．We use less than 10% of our brains.

B．Most brain disorders affect the same part of the brain.

C．The brain is less active during times of sleep.

D．The 10 percent theory does not make evolutionary sense.

【小题4】What can we infer from the passage?

A．People today use more of their brain than in the past.

B．Scientific opinion about the topic of brain use is equally divided.

C．Our understanding of the brain has changed greatly in the past decades.

D．Modern scientists have a complete picture of how the brain works.

【小题5】What is the main purpose of the passage?

A．To present two sides of brain theory.

B．To criticize the 10 percent theory.

C．To explain how brain works.

D．To describe the history of brain research.