Asyougrowolder,you’llbefacedwi-优题课

EVERYONE has those nights – you lie in your bed for hours, tossing and turning, totally unable to fall asleep. You wish you could just turn your brain off as if it were a light. That would make things much easier, wouldn’t it?
Now it looks like you are one step closer to this wild dream of yours – scientists from Oxford University, UK have just discovered the “switch” that tells the brain to go to sleep, reported Forbes.
To understand the study, you first need to know that there are two mechanisms (机能) that regulate sleep. There’s one that we’re already familiar with – our body clock, which works in a 24-hour cycle based on the light changes throughout the day.
The other one is what scientists call the sleep “homeostat (动态平衡系统)”. This mechanism has nothing to do with daylight. Instead, it keeps track of the brain’s waking hours and urges it to rest if it has been awake for a long time. “It is similar to the thermostat (自动调温器) in your home. A thermostat measures temperature and switches on the heating if it’s too cold,” Professor Gero Miesenböck, who led the study, told The Telegraph.
Our bodies use both of the mechanisms to regulate sleep. “The body clock says it’s the right time, and the sleep thermostat has built up pressure during a long waking day,” explained Miesenböck.
There is no way that scientists can trick the body clock. But with the sleep homeostat, there might be something they can do.
The researchers found that the sleep homeostat works by activating a specific group of nerve cells, or neurons, in the brain. They tested their theory on fruit flies by removing the neurons from the insects’ brains. And as expected, they found that the flies without the homeostat neurons did not keep a regular sleep pattern anymore.
Now that scientists have pinpointed (定位) the exact place in the brain – or, the “switch” – that regulates sleep, they can begin investigating (研究) how to activate these cells at any given time so that people can be sent to sleep instantly.
More importantly, figuring out how sleep mechanisms work may also help us to one day unravel one of the oldest mysteries of all: why do we need to sleep in the first place?
What is the article mainly about?

A．A new way to treat sleep disorders.

B．The discovery of the sleep “homeostat”.

C．Advice on what to do when you fail to fall asleep.

D．A comparison of the two mechanisms that regulate sleep.

How does the author explain the function of the sleep homeostat?

A．Through examples.

B．With comparisons.

C．Through cause and effect analysis.

D．By presenting research findings.

What can we conclude from the article?

A．Generally, the sleep homeostat has less effect on people during the day than at night.

B．There is little scientists can do to affect the way the sleep homeostat works.

C．What makes us go to sleep at night is probably a combination of the two mechanisms.

D．The more homeostat neurons there are in one’s brain, the more easily one can fall asleep.

The underlined word “unravel” in the last paragraph is closest in meaning to ______.

A．put up with

B．figure out

C．keep track of

D．take notice of

HE is one of the most charming young heroes since Harry Potter. Like Potter, he is chosen by fate to carry out a mission, but unlike the boy wizard, he doesn’t get any chances to have fun or hang out with friends because he’s a little too busy preparing to lead during an upcoming war to save the Earth.
Meet Ender Wiggin, 15, the main character of the hit US sci-fi movie Ender’s Game (《安德的游戏》), which will come out on Jan 7 in China.
The story opens in 2086, 50 years after an insect-like alien race, called the Formics, attacked the Earth and killed tens of millions of people before being driven back to their home planet. Since then, human beings have been in a state of fear, awaiting a second attack.
Earth’s military leaders seek young warriors to risk going into space for battle, and children are taught to compete for these positions. As the film explains, youths can make leaps of logic and intuition, devising effective attack strategies more quickly than adults.
So here comes Ender, the savior (救世主) of all mankind. Though Ender is a skinny kid, smaller than most, he is also smarter than average. He tends to analyze situations and easily find ways to achieve the most positive outcomes. This rare gift makes him stand out in the program and get promoted to the Battle School, where he is directed to plan and carry out a series of virtual attacks on the Formics.
Can he use his military talents to wipe out Earth’s enemies?
Despite the obvious “be all you can be” subtext (潜台词), the movie “explores complex issues, including the consequences of violence and maintaining humanity and morality during wartime with intelligence and insight,” commented Yahoo.
According to The Hollywood Reporter, the film best presents the power of empathy (感情移入), which is what makes Ender a good leader. “The reason Ender succeeds is because he understands what makes his opponents tick (有某种行为) on the battlefield,” explained the entertainment news site.
The underlined words “a mission” in the first paragraph probably refer to “______”.

A．having fun and hanging out with friends

B．being a boy wizard to save the Earth

C．working to save all of mankind

D．acting as a leader of the Formics

Earth’s military leaders want to choose youths to be warriors because they think ______.

A．youths are smarter and more fearless than adults

B．youths are more willing to take risks in space

C．youths have sharper intuition and quicker reactions than adults

D．youths adapt to new battle environments more quickly than adults

Which of the following statements is TRUE according to the text?

A．The movie intends to encourage people to try to be what they want to be and never give up.

B．Ender is able to defeat Earth’s enemies because he possesses a super power that enables him to read his enemies’ minds.

C．Ender’s success proves that a good leader should have intelligence and insight and make full use of his or her teammates’ talents.

D．The movie discusses a variety of issues such as the effects of violence and the importance of morality and humanity during wartime.

IT’S never a real problem for us when the weather gets cold. We can put on more clothes, stay next to a fireplace, turn on the air conditioner or simply travel to a warmer city to spend the winter – people have many different ways of coping with the cold.
But things are not as easy for plants. Unlike humans, plants can’t move to escape the cold or generate heat to keep themselves warm. So how do they manage to survive the freezing winter?
It turns out that plants have their own strategies too, said a study published on Dec 22 in the journal Nature.
According to researcher Amy Zanne of George Washington University, US, the cold is a big challenge for plants. Their living tissues can be damaged when they freeze. “It’s like a plant’s equivalent to frostbite (冻疮),” Zanne told Science Daily. Also, the process of freezing and thawing (解冻) can cause air bubbles to form in the plant’s water transport system. “If enough of these air bubbles come together as water thaws they can block the flow of water from the roots to the leaves and kill the plant,” she explained.
To live through cold weather, plants have developed three traits, according to the study. Some plants, such as oak trees, avoid freezing damage by dropping their leaves before the winter chill sets in – effectively shutting off the flow of water between roots and leaves – and growing new leaves and water transport cells when the warm spring returns.
Other plants, pine trees for example, protect themselves by narrowing their water transport cells, which makes it easier for cells to travel among air bubbles.
The third strategy is also the most extreme – some plants die on the ground in winter and start growing as new plants from seeds when conditions get warmer.
However, the study also found that these smart strategies were developed very slowly – over millions of years of evolution. This leads scientists to worry that plants may not be able to deal with human-caused climate change, which has only started occurring over the past few decades.
Scientists are hoping that this study can help people find possible ways to save plants from the threat of climate change.
What is the article mainly about?

A．Why plants are not afraid of the winter chill.

B．The ways that plants survive cold weather.

C．Changes in plants’ water transport system in winter.

D．How plants evolve to keep up with climate change.

According to the article, if a plant freezes in the winter, ______.

A．it produces more living tissues to stay alive

B．its leaves quickly fall out and its roots begin to die

C．lots of air bubbles form in its water transport system

D．its water transport system could be blocked in the spring

How do oak trees usually survive the cold winters?

A．By dropping their leaves before winter.

B．By narrowing their water transport cells.

C．By widening their water transport cells.

D．By leaving only the seeds alive and growing from the seeds in the spring.

What are scientists worried about when it comes to plants according to the article?

A．Plants may not be able to adapt to the increasingly cold climate.

B．Human activities might have a great impact on the pace of plants’ evolution.

C．Plants may not be able to evolve fast enough to adapt to human-caused climate change.

D．The strategies plants develop are not good enough to protect them against cold.

This is my world now; it’s all I have left. You see, I’m old. And, I’m not as healthy as I used to be. I’m not necessarily happy with it, but I accept it. Occasionally, a member of my family will stop in to see me. He or she will bring me some flowers or a little present, maybe a set of slippers—I’ve got eight pairs. And then they will return to the outside world and I’ll be alone again. Oh, there are other people here in the nursing home. Residents, we’re called. The majority are about my age. I’m 84. Many are in wheelchairs. The lucky ones are passing through—a broken hip, a diseased heart, something has brought them here for rehabilitation(康复). When they’re well they’ll be going home.
The help here is basically pretty good, although there’s a large turnover of staff. Just when I get comfortable with someone he or she moves on to another job. I understand that. This is not the best job to have. I don’t much like some of the physical things that happen to us. I don’t care much for a diaper(尿布). I seem to have lost the control acquired so diligently as a child. The difference is that I’m aware and embarrassed, but I can’t do anything about it. I’ve had three children, and I know it isn’t pleasant to clean another’s diaper. My husband used to wear a gas mask when he changed the kids. I wish I had one now.
Why do you think the staff insists on talking baby talk when speaking to me? I understand English. I have a degree in music and am a certified teacher. Now I hear a lot of words that end in “y”. There is little need for anyone to position their face directly in front of mine and raise their voice with those “y” words. Sometimes it takes longer for a meaning to sink in; sometimes my mind wanders when I am bored. But there’s no need to shout.
I’d love to go out for a meal or travel again. I’d love to go to my own church, sing with my own choir. I’d love to visit my friends. Most of them are gone now or else they are in different “homes” of their children’s choosing. I’d love to play a good game of bridge, but no one here seems to concentrate very well. My children put me here for my own good. They said they would be able to visit me frequently. But they have their own lives to lead. That sounds normal. I don’t want to be a burden. They know that. But I would like to see them more. One of them is here in town. He visits as much as he can.
Something else I’ve learned to accept is loss of privacy. Quite often I’ll close my door when my roommate—imagine having a roommate at my age—is in the TV room. I do appreciate some time to myself and believe that I have earned at least that courtesy(礼貌). As I sit thinking or writing, one of the aides invariably opens the door unannounced and walks in as if I’m not there. Sometimes she even opens my drawers and begins searching around. Am I invisible? Have I lost my right to respect and dignity? I am still a human being. I would like to be treated as one.
Back to my semiprivate room for a little semi-privacy or a nap(午睡). I do need my beauty rest; company may come today. What is today, again? The afternoon drags into early evening. This used to be my favorite time of the day. Things would wind down. I would kick off my shoes. Put my feet up on the coffee table. Pop open a bottle of Chablis and enjoy the fruits of my day’s labor with my husband. He’s gone. So is my health. This is my world.
Which of the following statements can be inferred from the passage?

A．The staff at the nursing home mistreated the elderly people.

B．Nursing home workers sometimes stole items from her drawers.

C．Her children did not often visit because they felt guilty for having put her in the nursing home.

D．The staff used baby talk with her because they assumed her mind had aged as her body had.

The author concluded her essay with a tone of ________.

A．dignity

B．sadness

C．disappointment

D．confusion

How will the author’s son most probably feel after he reads this essay?

A．Sympathetic.

B．Regretful.

C．Angry.

D．Relieved.

The best title for the passage would be ________.

A．The Disadvantages of Growing Old

B．If Only I could be getting better

C．The Elderly: A Forgotten Generation

D．The Place That Changed My Life

When Mary Barra took the wheel at General Motors in January she inherited a company in good shape. Five years after bankruptcy(破产), its profits were beyond expectations and its share price was rising. But the new boss's to-do list was long: fixing GM's loss-making European arm, keeping up momentum(势头) in China amid signs of a slowdown and giving new life to the product line. The former CEO, Dan Akerson, warned her that she would also face unexpected challenges. The first has arrived sooner than she might have expected.
What appeared to be a routine recall(召回) of about 800,000 older models, linked to a faulty ignition(点火) switch, has turned out to be anything but. The number of cars recalled has leapt to more than 2.6 million. The company's clumsy handling of a safety problem that first became apparent a decade ago is now linked to the deaths of at least 13 motorists.
Called before Congress to answer for GM's failings Ms Barra said she was “deeply sorry” but insisted that the post-bankruptcy “new GM” was not like the “old GM”, which had failed to deal with the ignition switches for years. Politicians and the public alike want to know how such a problem could have remained unaddressed for so long.
Cars are becoming ever more complex machines, with thousands of mechanical and electronic parts. Last year it happened to 22 million vehicles in America, compared with 18 million in 2012. In fact, GM was one of only three brands that recalled fewer vehicles than it sold. Minor problems, like squeaks(吱吱响) or rattles(卡嗒响), that do not affect safety are more common still. They may be fixed at a routine service; the owner may never know. The growing number of recalls is proof to an improving system for picking up faults.
But it is very complicated. Dealers must record replacements of parts under warranty(保修). The carmaker needs to spot the trend, recognize it as a problem and then determine whether or not it is a design fault that requires an extensive replacement. It relies on accurate recording of every warranty replacement in every region. This system appears to have broken down at “old GM”. Ms Barra needs to find out why.
The core problem is a widely used ignition switch that has a tendency to slip from the “on” position to “off” if a driver uses a heavy key-chain or bounces down a rough road. An improvement was made in 2008 to prevent the problem, which can lead to the engine shutting off, disabling the airbags. But despite a growing list of crashes and deaths, GM failed to order a recall for a component that would have cost a few dollars at most.
This is odd. Most carmakers want to identify and fix problems speedily despite having to bear the cost of buying and fitting a new component. A small part can do great harm, if bad publicity leads to reputational collapse, lost sales and law suits, including heavy penalties. Appearing to put profits before safety is an invitation to battering a firm's shares, as GM has discovered.
So far Ms Barra has handled the situation well. She seems to have acted as soon as she found out something was wrong. GM has appointed a worldwide safety president to cut through the process that may have delayed investigation and action. And in a sweeping housecleaning, GM has recalled another 2 million vehicles in America alone. GM looks set to accept moral, if not legal, responsibility. The terms of its exit from bankruptcy give immunity to lawsuits for injuries arising beforehand. But GM is likely to compensate survivors’ and victims' families anyway.
It is not yet clear how much of a hammering GM will take. But hours before Ms Barra's meeting with Congress, the Insurance Institute for Highway Safety issued a greatly desired “Top Safety Pick” for the new Chevrolet Malibu, one of a growing number of well-received cars from GM.
When Mary Barra took office, there was plenty more room for GM's improvement in that ________.
a. the development of Chinese market appears to be slowing down
b. former bosses have failed to fix GM's loss-making European arm
c. some car models lack appeal in the market
d. Mr. Akerson has left some challenges for her to handle
e. GM’s management teams are made up mainly of men

A． a, b, and e

B． b, c, and d

C． a, b, and c

D．a, c and d

What can be inferred from Paragraph 4?

A．Problems like squeaks or rattles are frequent reasons for recalls.

B．Recalls are not uncommon in the auto industry.

C．Car companies welcome recalls to demonstrate improved products and services.

D．Minor problems may be fixed at a routine service without the owners’ knowledge.

Mary Barra has carried out the following strategies to manage the crisis and quiet the critics EXCEPT that ________.

A．as soon as she learned about the problem, she acted without hesitation

B．she faced facts and apologized sincerely

C．she took the legal responsibilities for their previous mistakes

D．she appointed a new president for global safety for GM

What does the underlined word “battering” in paragraph7 probably mean?

A．Benefiting.

B．Regulating.

C．Purchasing.

D．Damaging.

What can we infer from GM's new Malibu being awarded “Top Safety Pick”?

A．GM's new model Malibu is specially designed to solve ignition problems.

B．GM products are gaining more and more popularity around the world.

C．GM seems to be on the road to saving itself from mistakes.

D．GM has worked out a solution to the broken-down recall system.

A．Students.	B．Parents.
C．Teachers.	D．Doctors.

A．Friendship	B．Making decisions
C．Self-confidence	D．Peer pressure