Dogs have a seemingly endless list of lovely behavior, and their curious head tilt(歪头) at human voices is no exception. While conducting a study on dogs’ ability to learn words, scientists stumbled upon a potential link between dogs’ memory and their head tilt.
In the study, researchers looked at the head tilt patterns of both“gifted”and “typical” dogs. Owners ordered their dogs to fetch a specific toy from another room. While most dogs struggled to memorize the name of just two toys, the seven “gifted” dogs-all of which were border collies(牧羊犬)could remember at least ten different toy names they'd been taught by researchers.
The team found that dogs that were particularly good at toy recall tilted their heads more often when hearing a command than dogs which weren’t as skilled. When they compared the dogs’ responses to a command from their owners, gifted dogs tilted their heads 43 percent of the time, while typical dogs did so just 2 percent of the time. It’s possible, scientists concluded, that the dogs’ head tilt may be a sign of paying attention or even matching a name to a visual image in their heads.
Researchers also discovered that dogs usually tilted their heads in the same direction regardless of where the owner was standing. The so-called “right-tilters“ and “left-tilters” may be a matter of individual preference. “The next step is to ask more questions to know what the head tilt really means, “says the researcher Monique Udell. “Can we use head tilting to predict word-learning ability, or attention, or memory?””
The researchers agree that the study is still in the early stages. For now, dog owners can take comfort in knowing that their dogs’ head tilt maybe a lovely attempt to better understand them.
1. Which of the following best explains “stumbled upon“ underlined in paragraph 1?A.Broke by accident. | B.Discovered unexpectedly. |
C.Imagined without reason. | D.Investigated secretly. |
A.Find out the hidden toys. |
B.Find the name of the toys. |
C.Separate the different toys. |
D.Go to get the toys mentioned. |
A.Their responses were faster. |
B.They tilted their heads more often. |
C.They tilted their heads to the left more often. |
D.They were more easily influenced by the owners’ locations. |
A.Dogs mainly communicate by tilting their heads. |
B.Dogs have developed specific communication skills. |
C.A new study offers a clue as to why dogs tilt their heads. |
D.Border collies are the smartest species in the animal kingdom. |
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【推荐1】The last African elephant at the Johannesburg Zoo, Lammie, lost her male partner to a sickness in September.
Lammie was born in the zoo 39 years ago. She had lived for 17 years with Kinkel, who died at age 35. Kinkel had been rescued in the wild after his trunk was caught in a trap in 2000. Around the time of her partner's death on Sept. 4, Lammie had stopped eating. The day before Kinkel died, she was seen trying to help him get up. Elephants are known for their intelligence, strong social ties and even the ability to mourn (哀伤). Some people argue Lammie should be sent to another place where she can be with other elephants.
Audrey Delsink is wildlife director of Humane Society International/Africa. She said, Lammie “is in desperate need of a happier existence and the chance to live out her years with other elephants.” Delsink added that a wildlife rescue place is ready to take Lammie if the Johannesburg Zoo agrees to let her go.
But the zoo says Lammie is staying. The zoo says it serves an educational purpose, especially for the poor who cannot pay to visit wildlife parks.
Michele Pickover disagrees. She is director of the EMS Foundation, a South Africa-based African wildlife rights group. She said “nobody learns anything” by seeing an elephant in captivity (被圈养). She said that watching a film about elephants would be more educational.
But, a spokeswoman for the Johannesburg Zoo, Jenny Moodley, says it is looking for a new partner for Lammie. She said the zoo is following guidelines in its search set by the World Association of Zoos and Aquariums. She added that experts are closely observing Lammie and that the elephant might not adapt well to a new environment. Moodley said of Lammie: “She is coping incredibly well, considering that she has lost her partner.”
1. What do we know about Lammie ?A.She used to be rescued in the wild. |
B.She lost her friends. |
C.She was sad because of her partner’s death. |
D.She has been sent to another zoo. |
A.Use Lammie to educate poor people. |
B.Let Lammie stay in the zoo. |
C.Ask experts to take care of Lammie. |
D.Let Lammie live in a wild life rescue place. |
A.Lammie has recoverd from the pain. |
B.Lammie doesn’t need another partner. |
C.Lammie will be sent away soon. |
D.Lammie is well taken care of. |
A.Rescuing the elephant |
B.The sad story of an elephant and her partner |
C.Should the last elephant stay or go? |
D.Can elephant live happily without a partner? |
【推荐2】There have been numerous wake-up calls about the effects of climate change on sea life. As ocean waters heat up, they are making coral lose color. Growing levels of carbon dioxide are making seawater more acidic. Now climate change is starting to affect fish's sense of smell, a phenomenon that will worsen in the coming years if global warming continues growing.
A sense of smell is what the fish can't do without. They use it to find food, detect upcoming danger, escape from predators (捕食者)find safe environments, and even recognize one another. "Future levels of carbon dioxide can have large negative effects on the sense of smell of fish, which can affect fish population numbers and the entire ecosystem, ”said an ocean life expert. "This can be prevented, but we must reduce carbon emissions now before it's too late.”
Experts believe that about half of carbon dioxide emissions produced by human activities, such as the burning of fossil fuels--have over time ended up in the oceans, lowering the pH of seawater, and making it more acidic.
Researchers found that sea bass (鲈鱼)exposed to the more acidic conditions swam less and were less likely to react when encountering the smell of a predator. Also, they were more likely to "freeze", a sign of anxiety, according to the study. They found the longer the fish were in high CO2,the worse they got along. The researchers also measured the ability of the fish to detect certain odors (气味)in different levels of acidity (酸度)。 The study showed that their ability to detect and respond to some odors connected with food and threatening situations was more strongly affected than other odors.
The research is important because 20 percent of the protein consumed by 3 million people comes from seafood, and about 50 percent of this comes from fish caught from the wild. “Therefore, increases in carbon dioxide in the ocean have the potential to affect all fish species, including those that many people rely on food and livelihood, "the ocean life expert warned.
1. What do we know from the first paragraph?A.Global warming will continue in the coming years. |
B.Global warming is starting to affect fish's sense of smell. |
C.The temperature of seawater is rising to a dangerous level. |
D.Few people are worried about the impact of climate change. |
A.It can affect the survival of fish. |
B.Fish can stay safe with their sense of smell. |
C.Fish rely on their sense of smell to find food. |
D.Fish can find each other by their sharp noses. |
A.He wants to blame human beings for global warming. |
B.He wants to criticize human beings for overuse of fossil fuels. |
C.He concludes that human activities can destroy the sense of smell of fish. |
D.He concludes that human activities can improve the ecosystem of the ocean. |
A.Satisfied. | B.Enthusiastic. | C.Disappointed. | D.Concerned. |
Trees are useful to man in three very important ways: they provide him with wood and other products; they give him shade; they help to prevent drought and floods.
Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important. To make money from the trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had.
Two-thousand years ago, a rich and powerful country cut down-its trees to build warships, with which to gain itself an empire. It gained the empire, but since the trees were cut down, its soil became hard and poor. When the empire fell to pieces, the home county found itself faced by floods and hunger.
Even where a government realizes the importance of an enough supply of trees, it is difficult for it to let the villagers see this. The villagers want wood to cook their food with, and they can earn money by selling wood to the townsmen. They are usually too lazy or too careless to plant and look after new trees. So, unless the government has a good system of control or can educate the villagers, the forests will not get protected. This does not only mean that the villagers’ sons and grandsons will have fewer trees. The results are even more serious. Where there are trees, their roots break the soil up, allowing the rain to sink in, which makes the soil stick together and prevents it being washed away easily. Where there are no tree, the rainfall son hard ground and flows away on the surface, causing floods and carrying away with it the rich top-soil, in which crops grow so well. When all the top-soil is gone, nothing remains but worthless desert.
1. Why do men cut down trees in large numbers in many places? (No more than 10 words)2. What happened to the soil after trees were cut down in the rich and powerful country? (No more than 5 words)
3. What should the government do to protect the trees? (No more than 15 words)
4. What does the underlined phrase “sink in” in the last paragraph mean in English? (No more than 5 words)
5. Do you think it is important to protect trees? Why do you think so? (No more than 20 words)
【推荐1】Muscles make an excellent vaccine administration site because muscle tissue contains important immune cells. These immune cells recognize the antigen, a tiny piece of a virus or bacteria introduced by the vaccine that stimulates an immune response. In the case of the COVID-19 vaccine the immune cells in the muscle tissue pick up these antigens and present them to the lymph nodes. Injecting the vaccine into muscle tissue keeps the vaccine localized, allowing immune cells to sound the alarm to other immune cells and get to work. Once a vaccine is recognized by the immune cells in the muscle, these cells carry the antigen to lymph vessels, which transport the antigen-carrying immune cells into the lymph nodes. Lymph nodes, important parts of our immune system, contain more immune cells that recognize the antigens in vaccines and start the immune process of creating antibodies.
Muscle tissue also tends to keep vaccine reactions localized. Injecting a vaccine into the deltoid muscle may result in local inflammation or soreness at the injection site. If certain vaccines are injected into fat issue, the chance of painful redness or swelling increases because fat tissue has poor blood supply, leading to poor absorption of some vaccine components.
Yet another deciding factor in vaccine administration location is the size of the muscle.
Adults and children aged three and older tend to receive vaccines in their upper arm in the deltoid. Younger children receive their vaccines mid-thigh because their arm muscles are smaller and less developed.
Another consideration during vaccine administration is convenience and patient acceptability.
Can you imagine taking down your pants at a clinic with strangers around? Rolling up your sleeve is much easier and more preferred.
1. How many reasons are mentioned for the vaccines given in the muscle?A.2 | B.3 | C.4 | D.5 |
A.Muscle tissue contains vital immune cells. | B.Muscle tissue stimulates immune responses. |
C.Muscles can easily recognize bacteria. | D.Muscles can prevent reproduction of viruses. |
A.Poor blood supply. | B.Local pain. |
C.Rapid fat loss. | D.Better absorption. |
A.an advertisement | B.a novel | C.a speech | D.a journal |
【推荐2】Wikipedia, the online encyclopedia (百科全书), is the largest encyclopedia ever. An encyclopedia is a collection of informative articles about various things. Encyclopedias used to be printed as books.
“Wiki” is an Internet term that means “a website that can be edited by the public”. It comes from “wikiwiki”, a Hawaiian word for “quick”. Two Americans, Jimmy Wales and Larry Sanger, created Wikipedia in 2001.
Today Wikipedia faces many challenges. It does not rely on advertising.
Despite these difficulties, Jimmy Wales says he will still stick to his dream. He has big plans for the future. He wants Wikipedia available in all of the world’s languages.
A.Most of its editors are volunteers. |
B.Now, they are mostly found online. |
C.Wikipedia employs an open editing model. |
D.Instead, all of its funds come from donations. |
E.It allows users to get information within seconds. |
F.It is now the fifth-most visited website on the Internet. |
G.However, some people doubt the accuracy of Wikipedia's content. |
【推荐3】Joseph Dituri hasn’t seen the sun for days. And he won’t see it again for months. Since March 1, the bio-medical engineer has been underwater, with the goal of spending 100 days there—for science.
The underwater living, if successful, will also break the current world record for time spent living underwater, which was set by two Tennessee biologists in 2014 when they stayed beneath the surface for 73 days.
Dituri, who uses the nickname Dr. Deep Sea, is living in Jules’ Undersea Lodge (小屋) in Key Largo, Florida—the same underwater spot where the previous record was set. The 100-square-foot hotel, which sits 30 feet below the surface, is his intended home until June 9, where he’ll be carrying out research and giving virtual lectures for his students at the University of South Florida.
As part of this research, Dituri is researching the effects of living in a high-pressure environment for an extended period. To keep water from entering the lodge, air must constantly be pumped into the space, which creates a pressure about 1.6 times that of Earth’s surface.
“The human body has never been underwater that long, so I will be monitored closely,” Dituri says in a press release. “This study will examine every way this journey affects my body.” Before taking the dive, Dituri had psychosocial, psychological and medical tests. He will continue to have testing during and after his 100 days at the lodge. He’s also taking doses of Vitamin D and keeping regular psychological appointments.
Beyond research, the project is also a chance to promote ocean protection and encourage young scientists. “The oceans are in a bit of trouble―the coral reefs are under attack, and the fishing industry is collapsing,” Thane Milhoan, habitat operations manager for Jules’ Undersea Lodge, says in a video. “We wanted to make use of the attention that the 100-day mission would demand to inspire the youth, more so than anybody, to get involved and start taking action.”
1. What is the reason for Joseph Dituri’s living underwater?A.To enjoy a unique hotel. | B.To do scientific research. |
C.To break the world record. | D.To promote an undersea lodge. |
A.By pumping air into the lodge. | B.By increasing the water pressure. |
C.By changing the underwater spot. | D.By extending the surface of the hotel. |
A.To keep a positive mood. | B.To adapt to the environment. |
C.To see the effects of the study on him. | D.To examine the change of the surroundings. |
A.Breaking down. | B.Coming out. |
C.Operating well. | D.Growing fast. |
【推荐1】Set to launch on October 16, the Lucy spacecraft is designed to study Jupiter’s Trojan asteroids (小行星). These asteroids are small bodies leftover from the formation of our solar system’s large planets. They share an orbit with Jupiter as the planet goes around the sun. The mission’s aim is to gather new information about the solar system’s formation 4.5 billion years ago.
Lucy will observe eight asteroids over 12 years. One of the eight asteroids orbits in what is known as the Asteroid Belt , an area between Mars and Jupiter. Most known asteroids orbit within this area. The spacecraft will also observe seven Trojan asteroids. Scientists consider the Trojan asteroids to be the ancient remains of the formation of the solar system. They have stayed captured in Jupiter’s orbit for billions of years. The Trojans circle the sun in two groups. One group leads Jupiter in its orbital path, while the other follows behind it. Lucy will be the first spacecraft to visit these asteroids.
The spacecraft was named Lucy after the ancient fossil discovered in Ethiopia in 1974. Lucy was one of the most famous scientific finds of the 20th century. The collection of skeletal bones gave scientists a better understanding of the evolution of humans. Cathy Olkin, the deputy lead investigator for the Lucy mission, compared the NASA spacecraft to the Lucy fossil. “Just like the Lucy fossil transformed our understanding of human evolution, the Lucy mission will transform our understanding of solar system evolution.” she said.
The spacecraft is equipped with several imaging instruments designed to capture information about the composition of materials on the surface of asteroids. Other equipment will be used to record asteroid surface temperatures and measure the size of the objects the space-craft observes. Lucy will depend on solar power to operate. NASA says the mission expects to set a record because Lucy will travel farther from the sun than any past solar powered spacecraft.
Lori Glaze is the director of NASA’s planetary science division. She said “Whatever Lucy finds will give us vital clues about the formation of our solar system.”
1. What is the mission of the Lucy spacecraft?A.To explore the surface of Jupiter. |
B.To collect soil samples from Mars. |
C.To find out the origin of solar system. |
D.To search for life on Trojan asteroids. |
A.They all orbit in the Asteroid Belt. |
B.They were discovered 12 years ago. |
C.They share the same orbit with Jupiter. |
D.They are the oldest planets in solar system. |
A.The inspiration for the name of Lucy. |
B.The significance of the Lucy fossil. |
C.The introduction to the Lucy mission. |
D.Cathy Olkin’s study on human evolution. |
A.It has a large space inside. |
B.It is powered by sustainable energy. |
C.It moves faster with its lower weight. |
D.It gets closer to the sun than other spacecraft. |
【推荐2】Technology use seems to be the new wave of addiction hitting people of all ages. Its extreme use can be compared to the use of drugs, which is called Plug-in Heroin.
The next time you’re in a crowded public place, look at the people around you. It’s hard to find someone who isn’t glued to the tiny screen, fingers moving at lightning speeds, texting their friends, emailing co-workers or listening to music. It may seem ridiculous that someone is that addicted to such a small object. I’ve seen people who seem to be at their wits’ end if their phone or iPad has been taken away, lost or left at home.
Some people may ask, “What’s wrong with technology use? It’s a way for people to communicate.” While this is true, the overuse of technology isn’t always appropriate in certain settings. Schools are becoming stricter about the use of cell phones, iPads and other electronics in classrooms. Various workplaces have signs hanging on their walls warning employees that “Cell phone use is not permitted” or “Cell phones are forbidden.”
Electronics may be a way for people to communicate and stay in touch with each other, but the disadvantages may outweigh the benefits. People are losing the ability to hold face-to-face conversations with others. However, it’s hard to avoid electronics in this day and age because almost everything is turning into an electronic format. Books, originally meant for paper design, are now being transferred (转存) to electronic forms. Photo albums, and even yearbooks, can now be viewed via the internet. With this growing trend, future generations are bound to become even more addicted to technology.
Is there a cure for electronic addiction? Simply turning electronics off for an hour or two a day may help to an extent, but it will not completely rid electronic addiction. There only seems to be one cure left, and it may be the hardest: self control.
1. What is Plug-in Heroin?A.The growing popularity of electronics. |
B.The unreasonable dependence on electronics. |
C.The future possibility of technology development. |
D.The serious consequences of technology use. |
A.Exhausted. | B.Confused. | C.Lost. | D.Surprised. |
A.Too many things are available in electronic forms. |
B.The design of paper books is less interesting. |
C.It is a must to use electronics to keep in touch. |
D.Fewer choices are left for communication. |
A.Turn off the electronics for one or two hours. |
B.Limit the use of electronic devices in classrooms. |
C.Learn to control yourself over the use of electronics. |
D.Cell phones should be forbidden in the workplaces. |
【推荐3】One of the many aspects of “normal” life that SARS-CoV-2 took away was the enjoyment of live musical performances. With the easing of lockdowns and restrictions in many parts of the world, performers can entertain audiences once again, but concerns about spreading the virus remain. Now, a research reported in ACS Environmental Au have studied aerosol (悬浮颗粒) production from playing wind instruments, singing and acting, allowing them to develop recommendations to minimize COVID transmission.
Early in the pandemic, COVID-19 outbreaks from choir performances indicated that singing carries a potential infection risk, but less is known about the risks of airborne infection from wind instruments. To help keep performers, audiences and music students safe, Tehya Stockman, Shelly Miller and colleagues wanted to examine aerosol production and flow in the air from various musical activities, as well as test different solutions.
The researchers examined the extent and speed of air circulation, or small drops of substances, coming from singers’ and actors’ mouths and from wind instruments, such as the flute, clarinet (单簧管), trumpet and saxophone. They also measured airborne aerosols and carbon dioxide levels exhaled from the performers. They found that aerosol concentrations coming from the bell of a clarinet were comparable to singing. Placing a surgical mask over a singer’s face or over the clarinet bell sharply reduced the extent and speed of air circulation and decreased aerosol concentrations in front of the masks. The team then used these measurements to model virus transmission in indoor and outdoor environments, finding that the lowest risk of airborne COVID-19 infection occurred at less than 30 minutes of exposure indoors and less than 60 minutes outdoors. These findings could help musical rehearsals and performances continue in a safer manner for musicians and audiences, the researchers say.
1. What is the purpose of the research?A.To remove lockdowns and restrictions. |
B.To promote live musical performances. |
C.To find ways to reduce spread of the virus. |
D.To reduce aerosol production from instruments. |
A.They have increased air flow from various musical activities. |
B.They have indicated that singing carries a possible infection risk. |
C.They have tried to measure the risk of infection from instruments. |
D.They have found out approaches to preventing aerosol production. |
A.breath out | B.give away | C.take in | D.test out |
A.Less than 30 minutes of exposure indoors avoids virus transmission. |
B.Using a surgical mask can reduce the risks of airborne virus infection. |
C.The manner of the musicians and audiences affects the risks of infection. |
D.Aerosol concentrations from a clarinet is much more obvious than singing. |