EVERYONE has those nights – you lie in your bed for hours, tossing and turning,
题型：不详难度：来源：
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?
小题1: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. |
| A．Through examples. |
| B．With comparisons. |
| C．Through cause and effect analysis. |
| D．By presenting research findings. |
| 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. |
| A．put up with | B．figure out | C．keep track of | D．take notice of |
答案
小题1:B
小题2:B
小题3:C
小题4:B
解析
试题分析：很多人有失眠的经历，那么大脑中有“睡眠开关”吗？科学家最近发现影响睡眠的除了生物钟，还有一种睡眠动态平衡系统，我们晚上睡觉的是两个技能的结合，科学家正在研究怎样通过睡眠动态平衡系统来改善我们的睡眠。
小题1:主旨题：根据第四段的句子：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.可知这篇文章讲的是睡眠动态平衡系统的发现，选B。
小题2:写作手法题：根据第四段的内容：可知作者解释睡眠动态平衡系统的的功能是通过和生物钟对比。选B
小题3:细节题：从第五段的句子：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.可知让我们晚上睡觉的是两个技能的结合，选C
小题4:猜词题：根据最后一段的句子：More importantly, figuring out how sleep mechanisms work may also help us to one day可知“unravel”的意思和前面的figure out相似，是“弄明白”，选B。
举一反三
This was the conclusion of a team of scientists from China"s State Forestry Administration and the World Nature Fund.
The South China tiger, also known as the Chinese tiger, is native to southern China. In the 1950"s, there were over 4000 tigers found in mountain forests in the country. But due to the destruction of their natural habitat and uncontrolled hunting, it has been pushed on to the list of the world"s top ten most endangered species.
Sixtysix of the big cats can be found in the cages of a dozen zoos around China. But they are nothing like their wild cousins. They have lost their natural skills such as hunting and killing. If they were set free they could not look after themselves.
“Breeding has damaged the quality of the species”, said Pei Enle, deputy director of the Shanghai Zoo.
To reintroduce the species into the wild, the country started a programme to send five to ten young tigers to South Africa. Four of them have already arrived. Progress has been made as two elder tigers have recovered some of their instincts(本能) and can hunt wild animals by themselves at the African base.
“South Africans are very experienced in reintroducing big animals to the wild. The country has very good natural conditions for the tigers to learn in”, said Lu Jun, office director of the National Wildlife Research and Development Center.“We tried in Fujian Province, but it was not successful as there was not a complete ecochain(生物链) and there was a lack of space.”
The tigers should return to China in 2007 when the reservations in Fujian are ready.
小题1:What is the main reason for the South China tiger becoming one of the world"s top ten most endangered species?
| A．Because it has lost its natural instincts. |
| B．Because there is not a complete ecochain. |
| C．Because there is no space for it. |
| D．Because uncontrolled hunting has destroyed its natural living conditions. |
| A．Its effect still remains to be seen. |
| B．Two tigers can already compete with their wild cousins. |
| C．Some of the tigers are already on the road to recovering their natural skills. |
| D．The tigers should be able to recover their instincts completely by 2007. |
| A．they are no longer feared by other wild animals |
| B．they don"t know how to hunt or kill |
| C．a complete change has resulted in the species because of breeding |
| D．to reintroduce them into the wild has become an urgent task |
| A．To help the tigers recover their ability to live in the wild. |
| B．To provide them with a better environment. |
| C．To get the tigers to go on a tour. |
| D．To find a complete ecochain for them. |
| A．Because the tigers can hunt wild animals by themselves at the African base. |
| B．Because South Africans are skilled at dealing with the tigers. |
| C．Because there is a complete ecochain and enough space there. |
| D．Because the country has good natural conditions for the tigers to learn in. |
Lead researcher Omri Gillath said the judgments were based on the style，cost，color and condition of someone’s shoes．In the study，63 University of Kansas researchers looked at pictures showing 208 different pairs of shoes worn by the study’s participants.Volunteers in the study were photographed in their most commonly worn shoes，and then filled out a personality questionnaire．
Some of the results were expected：People with higher incomes most commonly wore expensive shoes，and flashier shoes were typically worn by outgoing people．However，some of the more specific results are strange enough．For example，“practical and functional’’shoes were generally worn by more“pleasant"people，while ankle boots were more linked with ‘‘aggressive’’personalities．The strangest of all may be that those who wore‘‘uncomfortable looking” shoes tend to have “calm” personalities. And if you have several pairs of new shoes or take extreme care of them，you may suffer from“attachment anxiety"，spending lots of time worrying about what other people think of your appearance．There was even a political calculation in the mix with more liberal(主张变革的)types wearing“shabbier and less expensive” shoes．
The researchers noted that some people will choose shoe styles to mask their actual personalities，but researchers noted that volunteers were also likely to be unaware that their footwear choices were showing the deep side of their personalities．
小题1:What does this text mainly tell us?
| A．People’s personalities call be judged by their shoes． |
| B．Shoes convey false information about the wearer． |
| C．People know little about their personalities． |
| D．Shoes Call hide people’s real personalities． |
| A．look at pictures of different shoes |
| B．provide pictures of their shoes |
| C．hand in their commonly worn shoes |
| D．design a personality questionnaire |
| A．Pleasant people like wearing uncomfortable shoes． |
| B．Wealthy people often wear expensive shoes． |
| C．Flahshier shoes are typically worn by outgoing people． |
| D．Aggressive people are likely to weal"ankle boots． |
| A．become a political leader |
| B．have a calm character |
| C．worry about their appearance |
| D．wear strange shoes |
| A．teach how to choose shoes |
| B．describe different personalities |
| C．inform us of a new study |
| D．introduce a research method |
With so many photos and videos of cats and dogs doing cute things online, it’s easier than ever to answer which of these furry friends you like more. There are many reasons why people prefer one type of pet over the other. So, have you ever wondered what your preference for cats or dogs says about you?
In fact, a 2010 study done by Sam Gosling , a psychologist at the University of Texas, US, and his graduate student Carson Sandy found that dog people are more extroverted（外向的）agreeable and serious than cat people.
“Cats will occasionally engage in social activities, but usually after only a few minutes they will abandon the game. Dogs, on the other hand, will often engage in play, like fetching a thrown lull, for hours at a lime," said Modem Dog magazine.
Just on the basis of dogs" nature being more sociable than cats’, you may expect that the personalities of dog people also reflect higher sociability. And Cosling’s study found that dog people are generally about 15 percent more extroverted and 13 percent more agreeable, both of which are associated with social altitude.
In addition, dog people are 11 percent more conscientious than cat people.
“Conscientiousness" is a tendency In show self-discipline（自律）,to complete tasks and aim for achievement. This quality also shows a preference for planned rather than spontaneous （一时冲动的） behavior.
In comparison, cat people an; about 12 percent more anxious, but they are also 11 percent more “open” than dog people, due to a general appreciation for art, emotion, imagination, curiosity, adventure, unusual ideas and variety of experience. And people high on openness are more likely to hold unconventional beliefs.
Despite vast differences, there an some things that cat people and dog people have in common. “Both types of people consider themselves close to nature, dislike animal-print clothing and generally optimists. ” noted Mother Nature Network.
小题1:What does the article mainly talk about?
| A．Differences between dogs and cats in their personality qualities. |
| B．Factors that influence people’s preference for dogs or cats. |
| C．How raising a pet helps shape your personality. |
| D．What your preference for dogs or cats reveals about you. |
| A．get involved in | B．benefit from |
| C．take little interest in | D．perform well in |
| A．be more imaginative and creative |
| B．live a more organized life |
| C．love to get close to nature more |
| D．be more easygoing and adventurous |
| A．are generally self-disciplined |
| B．are usually positive and care about nature |
| C．are likely to hold unconventional beliefs |
| D．like to wear animal-print clothing; |
Yes, sportsmen tend to be handsome. And they haven’t only attracted the interest of the audience even scientists are now studying their good looks.
In a recent study, Erik Postma, a biologist at the University of Zurich in Switzerland, collected the headshots（头像）of 80 professional athletes from I hr 2012 Tour He France, a bicycle race held in Franco. The race, which covers 3,200 kilometers in 23 days, is often considered to In* one of the hardest endurance（耐力）events, according to The Telegraph.
Postma then asked female participants to score the cyclists’ attractiveness.judging them only based on their facial appearances. So, if a participant recognized any of the cyclists, meaning she knew how good he was at the sport, her score wouldn’t count.
After comparing all the scores with the cyclists’ performances in the 2012 race, Postma was surprised to find that the best riders were rated on average 25 percent more attractive than the worst ones. For example, one of the cyclists, Maxime Monfort , came third in terms of attractiveness and sixth in terms of performance, reported Discovery News.
But where did women get the ability to single out a good rider by simply looking at his face?
According lo Postma, evolution (进化) seems to be the answer. In ancient times, women preferred to marry strong men because they would provide good genes for their children. A man with great endurance was also able to cover long distances to hunt for food, which would allow him to better feed the family. “That’s why endurance performance was a key evolutionary factor.” Postma told Discovery News.
As you can see, it’s not that sportsmen ate more attractive themselves, women were just born to think of them that way.
Perhaps surprisingly, when Postma did the same test with male participants, he found that men actually had a quite similar view on which riders were handsome. Even
though most men aren’t aware of it. they inherited (继承) this ability from their ancient past, when it was necessary to “spot potential competitors” , explained Postma.
小题1:What did Erik Postma ask female participants to do in his study?
| A．To help collect the headshots of professional cyclists from the Tour de France. |
| B．To pick out the cyclists whom they are familiar with or appreciate most. |
| C．To rate the cyclists’ attractiveness according to facial appearance. |
| D．To predict the cyclists ’ performances based on facial appearance. |
| A．The more attractive a cyclist was, the better he performed in the race. |
| B．Generally, a cyclist’s endurance had nothing to do with his attractiveness. |
| C．Attractive cyclists proved to have less endurance than those who were less attractive. |
| D．Those who performed best in the games were considered more attractive than those who performed worst. |
| A．Women and men hold quite different views on male attractiveness. |
| B．Men with good looks tend to lie less popular than men with great endurance. |
| C．A man with great endurance appealed to women in ancient times and this remains the same today. |
| D．Most men don* t have the same ability as women to single out a good sportsman by simply looking at his face. |
Early artists drawing these animals accomplished a monumental and difficult task．They did not limit themselves to the easily accessible walls but carried their painting materials to spaces that required climbing steep walls or crawling into narrow passages in the Lascaux complex．
Unfortunately，the paintings have been exposed to the destructive action of water and temperature changes，which easily wear the images away．Because the Lascaux caves have many entrances，air movement has also damaged the images inside．
Although they are not out in the open air, where natural light would have destroyed them long ago，many of the images have been destroyed and are barely recognizable．To prevent further damage，the site was closed to tourists in 1963，23 years after it was discovered．
小题1:What can be the best title for the text?
| A．Wild Animals in Art | B．Hidden Prehistoric Paintings |
| C．Exploring Caves Respectfully | D．Determining the Age of French Caves |
| A．discovers | B．watches | C．notices | D．buys |
| A．Birds | B．Bison | C．Horses | D．Wild cats |
| A．It was completely dark inside． |
| B．The caves were full of wild animals． |
| C．Painting materials were hard to find． |
| D．Many painting spaces were difficult to reach． |
| A．temperature changes | B．air movement |
| C．water | D．tourists |
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