An afternoon nap(午睡)is one of the joys of life, although too much napping could signal all is not well. In some cultures, people will have a daily nap — this is fine. The warning comes when people start sleeping during the daytime, when they did not before. There is certainly a good reason to believe that daytime sleepiness — as in the Alzheimer's study — can be a marker of an underlying condition.
For most people, napping during the day is mainly a sign that you are not getting enough sleep at night, says Dr. Neil Stanley, a sleep expert. "If you feel sleepy during the day, you should think about taking a nap. That is what the body needs — it doesn't need to be kept awake with caffeine, it needs sleep. "The feeling to notice is "sleepiness", he says, not "tiredness", which could be more psychological and linked to stress.
So how do you nap well? The key thing, says Stanley, is how long your nap lasts. Choose either a 20-or 90-minute nap. "When you fall asleep, you'll quickly go through the lighter stages of sleep into your first period of deep sleep. You don't want to wake up in deep sleep because that's when you wake and feel worse than you did before. "Napping for 20 minutes means you will wake up before you go into deep sleep; napping for 90 minutes means you'll complete a sleep cycle.
Once you factor in the time it takes to fall asleep — some people are better at napping than others but, says Stanley, "a healthy adult will fall asleep in between 5 and 12 minutes" — you can set an alarm, allowing a 30- to 40-minute period for a short nap, and up to two hours for a longer one.
A good time to nap is during the body's natural dip in the afternoon, between 2 pm and 4 pm. "You don't really want to be napping much past that because then you are going to be eating into your night-time sleep," Stanley says. The point, he stresses, is to get good night-time sleep, which would ensure you probably don't need to nap at all.
1. What does an afternoon nap indicate for most people?| A．Caffeine addiction. | B．Psychological stress. |
| C．Insufficient night sleep. | D．Potential physical illness. |
| A．Duration. | B．Surroundings. | C．Health. | D．Stages. |
| A．A 30- to 40- minute period. | B．Between 2 pm and 4 pm. |
| C．Between 5 and 12 minutes. | D．A 20- to 90-minute period. |
| A．Why to phase a nap | B．When to take a good nap |
| C．What to learn from a nap | D．How to have a successful nap |
相似题推荐
【推荐1】An 18,000-year-old human genome has been sequenced (测定序列) as a consequence of genetic research of ancient African skeletons, showing information as to how the continent’s former people lived, migrated (迁移), and reproduced.
In general, DNA cannot survive in Africa’s heat and damp for long periods of time, and researchers have never previously (先前地) sequenced a sub-Saharan African human genome older than 9,000 years. The authors of this new study, on the other hand, regained genetic material from six people buried between 5,000 and 18,000 years ago.
They also looked at the records of 28 previously reported individuals found at burial sites around the continent, and these 34 people were from three unique source populations originating in northeastern, central, and southern Africa after studying their DNA. This means that the continent was originally inhabited by three distinct groups who must have lived in remote areas for long periods of time. The combination of these three branches, on the other hand, suggests that genetic information was exchanged between the three populations before 20,000 years ago. According to the authors of the study, this process began around 50,000 years ago, because archaeological records suggest an increase in the movement of products over great distances around this time. People are thought to have started having children with partners from far-away places as trading networks grew across the continent.
However, the genomic data shows that this long-range DNA interchange began to decline some 20,000 years ago, implying that humans began reproducing with their immediate neighbors at that time. According to the study’s authors, it may be due to the Last Glacial Maximum, when climate change may have limited people’s movement and pushed them to become more sedentary.
In a statement, study author Jessica Thompson noted, “At first, people found their mates from a far-away place. Further down the line, people valued partners who lived closer to them and were perhaps more culturally similar.” Co-author Elizabeth Sawchuk added, “Perhaps it was because previously established social networks allowed for the movement of information and technologies without requiring people to migrate.”
1. What is the challenge of the DNA study in Africa?| A．Limited technology. | B．Hot and wet climate. |
| C．Too many cultural exchanges. | D．Complex human genomes. |
| A．Climate change. | B．Archaeological records. |
| C．Trades with distant groups. | D．Development in technology. |
| A．Stable. | B．Diverse. | C．Active. | D．Mobile. |
| A．Distant social exchange was booming 50,000 years ago. |
| B．Long-ranged DNA interchange started to occur 20,000 years ago. |
| C．Communication with people from similar cultures was always preferred. |
| D．Migration decreased when social networks for information became mature. |
【推荐2】Crop diversity (多样性）is important to feed the increasing population of our planet. Agricultural experts say having a large variety of plants also helps to protect crops against possible diseases and future risks. Hundreds of thousands of different plants now exist. But many experts say the number has decreased sharply during the past century.
One of the world's largest seed conservation projects has predicted further losses. The Millennium Seed Bank Partnership is warning that up to one hundred thousand plant species could permanently disappear. The rich collection of genes that decide their qualities would disappear with them.
Not all experts agree that a decrease in cultivated(培植的）food crops is a risk. A recent study, led by Paul Heald of the University of Illinois College, showed a different situation, at least in the United States. The study examined records of plant varieties in America during the past century. They found that the total number of vegetable and apple crop varieties in the United States did not fall over the past century. Instead, he says, the study may show a small increase in the number of varieties.
For those who regard it as a major risk, they blame climate change and loss of habitat, normal growth area, for damaging plant life. They note human activities also contribute to the problem. Besides, the United Nations Food and Agriculture Organization says modern business farming is responsible for loss of farmers’ traditional crop varieties. Some scientists and others blame patenting for what they say are losses of crop diversity. A patent is the legal right of an inventor to a process or a product, even a plant. To get this right, the inventor has to demonstrate the qualities that make the patented plant different from other plants.
But the study led by Professor Paul actually failed this assumption. Professor Paul said, “People tend to believe what they want to believe. But as a scientist, I must believe the study results. ”
1. The author begins the text by ______________.| A．listing possible crop diseases |
| B．stating the significance of crop diversity |
| C．giving the definition of crop diversity |
| D．describing a number of existing plants |
| A．show America’s great achievement in protecting crop diversity |
| B．give a different opinion that the number of crop varieties is increasing |
| C．explain the present situation of vegetables and apple crop varieties |
| D．support the viewpoint that the number of crop varieties is decreasing |
| A．the reasons for crop diversity decreasing |
| B．the unfavorable comments on patented plants |
| C．the further losses caused by plant diversity decreasing |
| D．the harmful effects brought by modern business farming |
【推荐3】Cherry blossoms (樱花) in Kyoto, Japan, reached peak bloom (绽放) on March 26 this year — the earliest the event has occurred in 1,200 years of records. Why so soon?
According to records previously collected by Professor Yasuyuki Aono, Kyoto’s cherry blossoms had consistently flowered around April 10 to 17 for over a thousand years. The Washington Post reports that Japan’s most famous flowers have been trending toward blooming earlier each spring, with scientists blaming the phenomenon on increasing global temperatures. And this year, the peak has shifted all the way into the previous month. “The Kyoto Cherry Blossom record is incredibly valuable for climate change research. Even a slight drop or rise of springtime temperatures can be recorded by it,” research scientist Benjamin Cook said, noting that warmer temperatures typically mean cherry blossoms bloom earlier.
Cherry blossoms are influenced so easily by temperature that trees in Tokyo even bloomed in autumn after typhoons caused warmer weather in 2018. Meanwhile, Aono estimated that Kyoto has warmed by 3.4 degrees Celsius since 1820.While this year’s cherry blossom peak was Kyoto’s earliest in 1,200 years, this isn’t the case in other parts of Japan Tokyo reached peak bloom on March 22, which is three days earlier than average and the earliest date since 1953.
However, the global trend seems to be slowly pushing cherry blossoms into full bloom to earlier in the year regardless of where they’re planted. In 2019, scientist Patrick Gonzalez noted that the trend of earlier blooming seen among cherry blossoms in Washington was “consistent with human-caused climate change.”
Cherry blossoms are considered in full or peak bloom when 80 percent of the flowers have bloomed, which usually occurs within a week of the first flowers opening. Elements other than may also be involved in the early blooming. Gonzalez offered the warning that “no research has examined all of the factors, and it is a long way to go.”
1. How does the author introduce the topic?| A．By stating a fact. | B．By giving an example. |
| C．By describing a custom. | D．By sharing an experience. |
| A．Cherry trees will die in cold weather. | B．Springtime temperatures are falling. |
| C．Cherry is sensitive to temperature change. | D．Early blooming also appeared elsewhere. |
| A．The studies have covered all factors. |
| B．Further scientific study is still needed. |
| C．Climate change is the only influential factor. |
| D．Reasons of early blooming have been identified. |
| A．To discuss the negative impact of human-caused climate change |
| B．To appeal to the public to appreciate Cherry blossoms |
| C．To call attention to the increasing global temperatures |
| D．To introduce one influential factor of Cherry blossoms blooming |
【推荐1】Trust me, you don’t want to get caught under a tsunami! Tsunamis are one of the world’s most powerful natural forces. They can cause huge amounts of damage.
But do you know exactly what a tsunami is? They are huge, powerful waves in the ocean that grow as they reach the shore. Most tsunamis are actually caused by earthquakes. An earthquake happens when a big piece of the Earth’s crust( 地 壳 ) suddenly moves. When the piece of ocean floor moves, it creates big holes. The water floods in to fill these holes. When the water moves that quickly, it creates a huge wave. This is how tsunamis are born!
Other natural disasters like landslides, volcanic eruptions, and glaciers breaking off can also cause tsunamis. Once the water starts moving because of the force of the disaster, large waves begin to spread. These waves can move very fast. They have been recorded at speeds from 400 up to 500 miles per hour! They can also move across very long distances.
At first, the waves of the tsunami may not seem that tall. That’s because when the waves travel through the deep parts of the ocean, the top of each wave is very short. But as that wave comes near to the coast, it grows in height. Remember, the tsunami travels quickly. If you are sitting on a beach, you may not see the wave coming at first. But when the wave arrives, it will be like a towering wall of water. Some waves are as tall as 100 feet high. The biggest tsunami ever recorded happened in 1958 in Lituya Bay, Alaska. The wave was over 1,720 feet tall, and it wiped out trees, vegetation, and everything else in its way.
As frightening as tsunamis can be, you don’t need to worry too much about them. They don’t happen that often. Only about two tsunamis happen every year. And it is said that serious, really damaging tsunamis only happen about every fifteen years. So don’t worry.
1. Based on the information in the article, which natural disaster is not responsible for causing a tsunami?| A．tornado | B．volcanic eruption | C．earthquake | D．landslides |
| A．2 hours | B．3 hours | C．4 hours | D．5 hours |
| A．The waves of the tsunami always move slowly over a long distance. |
| B．People on a ship in the deep ocean will notice a tsunami at once as soon as it forms. |
| C．When people on the beach first notice a tsunami, the waves are not tall. |
| D．People will not notice a tsunami until it gets close to the coast. |
| A．in a newspaper | B．in a science magazine | C．in a textbook | D．in a story book |
【推荐2】There is a widespread belief among sleep researchers that many people, especially young adults, regularly obtain skimpy sleep due to work, school, and social activities. The move toward remote work and school has provided a novel opportunity to test this belief.
A new study compared self-reported data on sleep habits from 80 students enrolled in a 2020 summer session course with data collected from 450 students enrolled in the same course during previous summer semesters and suggests that students learning remotely went to bed an average of 30 minutes later than pre-pandemic (疫情前) students. They slept less efficiently, less at night and more during the day, but did not sleep more overall despite the time saved working or attending social events. Actually, they have no early classes and 44 per cent fewer work days compared to students in previous semesters.
One very consistent finding is a collective delay of sleep timing—people go to bed and wake up later. Not surprisingly, there is also a marked reduction in natural light exposure, especially early in the day. The lack of change in sleep time was a bit of a surprise, as it goes against the assumption that young adults would sleep more if they had the time.
Self-described night owls (夜猫子) were more likely to report a greater positive effect on their sleep, getting to sleep in, instead of waking up early for that morning class, while morning types were more likely to report a negative response to sleeping later than usual.
Sleep plays an important role in immune (免疫的) functioning and mental health, which is why good sleep habits are important. Students and anybody working from home should try to get outside and work out early in the day because the morning light helps strengthen their regular sleep wake cycle—this should improve their sleep, and allow them to feel more rested and energized during the day.
1. What does the underlined word “skimpy” in paragraph 1 mean?| A．Needful. | B．Good. | C．Unnecessary. | D．Insufficient. |
| A．They sleep more overall. | B．They sleep more at night. |
| C．They sleep no more than others. | D．They sleep less during the day. |
| A．Night owls. | B．Busy bees. | C．Lazybones. | D．Early birds. |
| A．Rising early to do morning exercises. |
| B．Developing irregular seep wake cycle. |
| C．Learning more about immune functions. |
| D．Getting rested and energized during the day. |
【推荐3】Sanlinx Inc. first introduced its original market defining SayaJoy Soy Milk Maker over 14 years ago to the North America market. Now we are introducing the SoyaPower G4, the fourth generation of advanced soy milk makers replacing the top rated SayaPower Plus.
The SoyaPower has been a best seller for nearly two years before it was replaced by the G4, with more favorable ratings than any other soy milk maker during its lifetime.
The SoyaPower G4 retains all the SoyaPower Plus features and functions. It makes soy milk, almond milk from other nuts seeds, or grains or a combination of them. It makes both fully cooked and raw milks. It even makes creamy soups and porridge and hot chocolate drink.
The Main Improvements
●The G4 adds stainless steel to the lower part of the machine head, and thus makes the total grinding and cooking chamber all stainless steel. This is very important for people who are concerned of plastic leaching into food.
●The G4 changed to bottom heating like a typical electric water kettle. Since soy milk or soups are easily burnt onto bottom heating plate, many other bottom heating makers suffer from this problem. The G4 solved this problem by using advanced technologies and design.
●The perfect technology ensures excellent grinding and milk yields. It also makes the use and cleaning even easier.
●Eight push button functions, for making milks from soaked beans, dry beans, and other seeds and grains or combination of them. It also makes soups and porridge. It even has a function to make hot chocolate!
1. Why is the SoyaJoy G4 produced?| A．SovaPower Plu sold badly. |
| B．The company is very famous. |
| C．The company wants to broaden market. |
| D．The company intends to open the North America market. |
| A．It can be used to fry chocolate. |
| B．It sometimes makes the soy milk burnt. |
| C．It mainly serves for the people minding plastic. |
| D．The most advanced technology is used on it. |
| A．keeps | B．replaces |
| C．obtains | D．prohibits |
| Waiter / Waitress A job as a waiter or waitress is a good choice for 16-year-olds. Not only can one earn $9-$12 an hour, but they can also get the tips (小费). Most people that visit a restaurant don’t just have good food. They come here to relax and have a good time. Besides serving food quickly, a young waiter who talks to them politely with a smile on his face will make the diners enjoy their time at the restaurant. |
| Work in a library If one is fond of books, working in a library is another suitable choice. Besides the pay is good, it offers a lot of free time when students can actually sit down and finish their homework. So on returning home, they would have time to hang around with friends or just relax. So working in a library is an excellent part-time job for teens, especially for school students. |
| Internet jobs There are many ways of making money through online jobs like clicking on advertisements, visiting sites and signing up with them. However, such online jobs don’t pay well. A better Internet job for teens is to complete online surveys. These are quite simple surveys that usually ask one about his/ her opinions and ideas. Many companies use these ideas to make products designed for teenagers. |
1. A student who is busy with his research paper will probably choose to work ______.
| A．in a restaurant | B．in a library |
| C．on the Internet | D．in an IT company |
| A．tell us the importance of doing part-time jobs |
| B．advise teenagers how to choose a part-time job |
| C．teach young people how to make lots of money |
| D．introduce his/her experience of doing part-time jobs |
| A．The teens have more free time. |
| B．They can pay less to the teens. |
| C．They need advice to make products for teens. |
| D．The teens usually express their true opinions. |
【推荐2】Lucy， whose skeleton（骨骼） was discovered in Ethiopia in 1974， died shortly after she fell out of a tree， according to a new study published Monday in the British journal Nature．
For their research， Kappelman and Dr． Richard Ketcham used a CT scanner to create more than 35，000 "slices" of Lucy's skeleton． Scientists named her Lucy from the Beatles song "Lucy in the Sky with Diamonds"， which was played at the camp the night of her discovery．
The following analysis of the slices showed sharp， clean breaks seen at the end of Lucy's right humerus （肱骨） are similar to bone breaks seen in victims of falls．
The researchers concluded that these and other breaks in her skeleton show that Lucy， who is believed to have stood about 3 feet 6 inches and weighed about 60 pounds， fell feet first and used her arms to support herself ﹣ but that the injury was too severe to have been survivable．
The researchers estimate that Lucy was going about 35 miles an hour when she hit the ground after falling from a height of roughly 40 feet， according to the statement．
That sounds plausible． But other scientists are doubtful． "There are countless explanations for bone breaks，" Dr， Donald C， Johanson， director of the Institute of Human Origins and one of the scientists who discovered Lucy， said， "The suggestion that she fell out of a tree is largely a just﹣so story and therefore unprovable． " Johanson said it was more likely that Lucy's breaks occurred long after she died， saying that "elephant bones appear to have the same kind of breaks， It's unlikely they fell out of a tree．
But the new research focused on "a small number of breaks" that are consistent with "high﹣energy bone﹣to﹣bone influences" and which differ from the sorts of breaks commonly seen in other collected bones． Kappelman responded in an email， "These appear to have occurred at or near the time of death． "
1. What can we infer about Lucy from Kappelman and Dr． Richard Ketcham's research？| A．She got her name from a song． |
| B．She had more than 35，000 slices． |
| C．She couldn't use her arms properly． |
| D．She made an effort to save herself． |
| A．Reasonable． |
| B．Creative． |
| C．Surprising． |
| D．Unbelievable． |
| A．Elephants are unlikely to die from falling． |
| B．Lucy got breaks at or near the time of death． |
| C．Other reasons for the breaks should be considered． |
| D．Lucy's bone breaks differ from other bone breaks． |
| A．Lucy didn't die from falling out of a tree． |
| B．The newly published study was meaningless． |
| C．The argument on how Lucy died will continue． |
| D．Scientists will find another way to solve the problem． |
【推荐3】Why do Americans struggle with watching their weight, while the French, who consume rich food, continue to stay thin? Now a research by Cornell University suggests how life style and decisions about eating may affect weight. Researchers conclude that the French tend to stop eating when they feel full. However, Americans tend to stop when their plate is empty or their favourite TV show is over.
According to Dr Joseph Mercola, a health expert, the French see eating as an important part of their life style. They enjoy food and therefore spend a fairly long time at the table, while Americans see eating as something to be squeezed between the other daily activities. Mercola believes Americans lose the ability to sense when they are actually full. So they keep eating long after the French would have stopped. In addition, he points out that Americans drive to huge supermarkets to buy canned and frozen foods for the week. The French, instead, tend to shop daily, walking to small shops and farmers’ markets where they have a choice of fresh fruits, vegetables, and eggs as well as highquality meats for each meal.
After a visit to the United States, Mireille Guiliano, author of French Women Don’t Get Fat, decided to write about the importance of knowing when to stop rather than suggesting how to avoid food. Today she continues to stay slim and rarely goes to the gym.
In spite of all these differences, evidence shows that recent life style changes may be affecting French eating habits. Today the rate of obesity — or extreme overweight — among adults is only 6%. However, as American fast food gains acceptance and the young reject older traditions, the obesity rate among French children has reached 17% — and is growing.
1. In what way are the French different from Americans according to Dr Joseph Mercola?| A．They go shopping at supermarkets more frequently. |
| B．They squeeze eating between the other daily activities. |
| C．They regard eating as a key part of their life style. |
| D．They usually eat too much canned and frozen food. |
| A．Americans and the French |
| B．life style and obesity |
| C．children and adults |
| D．fast food and overweight |
| A．by contrast (对⽐) | B．by space |
| C．by process | D．by classification (分类) |
【推荐1】
Oct. 23rd is the beginning of Shuangjiang or “Frost’s Descent” in English, the 18th of 24 solar terms(节气) in the Chinese lunar calendar. It refers to the time when frost(霜) starts to fall across China, or “the dews(露水) were frozen into frost” because of the coldness, as recorded in ancient Chinese books.
By the time of Shuangjiang, most of the harvesting work is already completed in northern China, and farmers are now able to enjoy a period of rest. But in the south, the harvest is still on the go. Farmers have to take home the sweet potatoes before they are destroyed by the coming frost. After a year of farming, it is the time to plow the fields and prepare the soil for next year in both south and north.
Autumn might be the most colorful season in China with the leaves turning from golden yellow to red. Hiking has become popular since the ancient times as people can enjoy the special autumnal scenery. Du Mu, a well-known poet from the Tang Dynasty wrote the beautiful mountainous scenery in a poem: “I stopped the coach as charmed by the maple woods; Frosted autumn leaves outshine February flowers in redness.”
The Double Ninth Festival also falls during the season, a festival for the elders. Going hiking in the highlands is part of the celebrations practiced by the ancient Chinese people.
“Keeping warm” becomes a most important thing at this time of the year as the weather is getting colder. Persimmon(柿子) is the favored fruit in many areas. The Chinese believe that persimmons could not only keep off the coldness, but strengthen the muscles and bones. Also, chicken or mutton soup is believed to be good for the spleen and advised for the diet.
Shuangjiang brings the frost and freezing wind, and autumn has come to an end. But for most Chinese, it is not necessarily a sad time because in winter, they are able to have different but equally beautiful scenery.
1. The underlined phrase “on the go” in the 2nd paragraph probably means ________.| A．admirable | B．mild | C．active | D．widespread |
| A．Coldness of frost. | B．View of autumn. |
| C．Autumnal farming. | D．The Double Ninth Festival. |
| A．Tell the differences of the harvest in China’s south and north. |
| B．Explain why Shuangjiang gets its name. |
| C．Advise some activities to enjoy the colorful season. |
| D．Introduce the ways to stay warm before the coming of winter. |
| A．People believe eating persimmons in Shuangjiang can help to get rid of coldness. |
| B．Shaungjiang is the best time for people who want to lose weight to take exercises. |
| C．Farmers in the south of China can enjoy a great rest during the time of Shuangjiang. |
| D．Shuangjiang is the end of summer and the beginning of autumn of a year. |
| A．What causes Frost’s Descent | B．Time to say goodbye to autumn |
| C．Enjoy the beautiful autumn | D．Prepare for a good harvest |
【推荐2】I believe in getting lost. Lost in the text of the novel that is particular to your thoughts and feelings that you consider special. Lost in the song that reminds you of your childhood summers, feeling the warm wind brushing against your arm as you ride your bicycle. Lost in the sip of cappuccino, idling the day away. Lost in the unprepared Sunday Drive, with no destination. You're free to wander, take paths that you've never noticed, discover places you haven't been. Then off the path to lead you back home, leaving you to test directions and alertly absorb your surroundings in order to find your way back; that kind of lost.
I get lost daily; whether it's in thought, or the unplanned drive I just decided to go on. Getting lost is an adventurous learning experience that trains you how to be more aware of your surroundings. A few of my most favorite memories involve physically getting lost. That one late night trip back to Ludington I took with a few friends. We finally realized we were going the wrong way, almost three hours out of our way. Another time, I got lost in the DeVos Place and then the parking garage for two hours solid. These are nervous experiences that get your anxiety pumping. You're fearful that you won't be safe, but it always works itself out in the end. Physically losing yourself prepares you for how you manage when you emotionally or mentally lose yourself.
You don't always have to be lost in a literal sense to "get lost" and some of the time, losing yourself may not be a positive experience. There are times where I lose sight of who 1 am. While lost, I test out metaphorical paths and sometimes they turn out to be the right direction and other times they are a wrong turn. I make note of these wrong turns, so I can avoid them further on up the road of finding my way back to who 1 am.
In Walden. Henry David Thoreau wrote "Not till we are lost, in other words not till we have lost the world, do we begin to find ourselves, and realize where we are and the infinite extent of our relations." Getting lost fuels my curiosity and teaches me lessons on finding many way back to the right track. I believe in getting. lost through day dreams, a misplacement, adventures, and difficult times when you make discoveries about yourself and the atmosphere around you. In order to truly find yourself, I believe that you should put down the map and get wonderfully lost.
1. The author believes in getting lost in ____________.| A．reading a well-received novel | B．listening to a song recalling the past |
| C．hanging out with friends in a cafe | D．going on a well-planned trip |
| A．physically getting lost is most difficult to deal with |
| B．we can enjoy trips while physically getting lost |
| C．people are easy to get physically lost in our daily life |
| D．we realize our surroundings while physically getting lost |
| A．enables us to look within and to see outward |
| B．pulls people back into the previous moment |
| C．enables us to remind ourselves of adventures |
| D．helps us enjoy ourselves wherever we are |
| A．Experiences of Getting Lost | B．Wonderfully Getting Lost |
| C．Causes of Getting Lost | D．Physically Getting Lost |
【推荐3】A human can't easily enter another species' social group to examine and influence what makes the animals tick. But the right robot can open up a clever way in.
Scientists have developed a robotic "fish" called SoFi in the hope of getting closer to marine life than ever before. The fish, which was developed by researchers at MIT's Computer Science and Artificial Intelligence Laboratory, can independently swim alongside real fish in the ocean. Fittingly, the robot has a fisheye lens on board that can take photos and videos of the marine it sees. Robert Katzschmann, lead author of the study, said: "We are all in an aroused state at the thought of the possibility of being able to use a system like this to get closer to marine life than humans can get on their own.”
While most underwater robots are tied to boats, SoFi has a much simpler and lightweight system that's found in smartphones. To swim, the motor causes water to flow into two balloon-like chamber in the fish's tail. As one chamber expands, it bends to one side, and then when the motors push water to the other channel, that one bends in the other direction. Together, these actions create a side—to—side motion, just like a real fish. The researchers hope that these realistic movements will help to ensure the robot is as safe in its environment as possible.
Daniela Rus, who also worked on the study, said: "The robot is able to closely observe marine life and appears not to be disturbing to real fish. "So far the robot has been tested in the Rainbow Reef in Fiji, where it swims at depths of more than 50 feet for 40 minutes.
1. Why have scientists developed the robotic fish?| A．To get close to observe marine life. | B．To prove the progress in robot technology. |
| C．To make the field of marine life interesting | D．To the intelligence of fishes in the ocean. |
| A．Crius | B．Excited | C．Nervous. | D．Worried. |
| A．Add more information to their study. | B．Convey the researohets satisfaction. |
| C．Compare different underwater robots. | D．Explain how the robotic fish works safely. |
| A．Robotic "Fish" that Can Record Marine Life in Detail |
| B．MIT`s Researchers who Have Developed Robotic Fish |
| C．Underwater robots that Influence Species in the Ocean |
| D．Rainbow Reef where the Robotic Fish Has Been Tested |
