I have spent the last few months with Yang, my new dog, one I am co-raising to be a service dog. He will stay with me for 14 months or so. If he proves to be good enough, he will be sent to the guide dog school for further training and eventually become a seeing-eye dog.
Dogs help people in lots of ways, but service dogs are different from working dogs, therapy (治疗) dogs, and emotional support animals. Service dogs are trained to do specific tasks for people with disabilities. They can pull wheelchairs, get medicine, remind you to take your medicine, help keep you stable while walking, and alert (警示) you to important sounds or dangerous things in your way. Service dogs have lots of different skills, depending on the disability they are trained for.
No matter how you get a service dog, they usually go through a tough training program with an experienced trainer. In the last month of training, the service dog spends time with you and the instructor. The instructor teaches the dog to help you, and tells you how to command, handle, and care for the dog.
Service dogs need obeying skills and other very special skills. When you think about how to get a service dog, consider finding one with relevant characters. They should be calm, be able to learn and hold onto information. To train a service dog, you should start with basic skills like focusing on you, ignoring disturbing factors and being able to stay on task in new places with new people, smells, and animals.
It’s important to keep your dog healthy so that they can best help you. Give your dog access to plenty of fresh water and a balanced diet, and keep their vaccinations (疫苗) updated. Yearly visits to the vet are also important to make sure you catch any changes in your dog’s health.
1. Why does the author mention Yang in paragraph 1?| A．To show his emotions. | B．To present a mystery. |
| C．To describe his daily life. | D．To introduce the main topic. |
| A．A healthy animal lover. | B．A person with sight disability. |
| C．A person requiring emotional support. | D．A policeman performing a special task. |
| A．Helping the owner to remain calm. |
| B．Learning to analyzing information. |
| C．Focusing on disturbing surroundings. |
| D．Handling different situations and areas. |
| A．Caring for Animals | B．Helping the Disabled |
| C．Keeping a Service Dog | D．Training a Special Dog |
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【推荐1】When I was six, Dad brought home a dog one day, who was called " Brownie" .My brothers and I all loved Brownie and did different things with her. One of us would walk her, another would feed her, and then there were baths, playing catch and many other games. Brownie, in return, loved each and every one of us. One thing that most touched my heart was that she would go to whoever was sick and just be with him/her. We always felt better when she was around.
One day, as I was getting her food, she chewed up(咬破)one of Dad’s shoes, which had to be thrown away in the end. I knew Dad would be mad and I had to let her know what she did was wrong. When I looked at her and said " bad girl" , she looked down at the ground and then went and hid. I saw a tear in her eyes.
Brownie turned out to be more than just our family pet. She went everywhere with us. People would stop and ask if they could pet her. Of course she’d let anyone pet her. She was just the most lovable dog. There were many times when we'd be out walking and a small child would come over and pull on her hair. She never barked (吠叫)or tried to get away. The funny thing is she would smile. This frightened people because they thought she was showing her teeth. Far from the truth, she loved everyone.
Now many years have passed since Brownie died of old age. I still miss the days when she was with us.
1. What would Brownie do when someone was ill in the family?| A．Keep him/her company. | B．Look at him/her sadly. |
| C．Play games with him/her. | D．Touch him/her gently. |
| A．would eat anything when hungry | B．felt sorry for her mistake |
| C．loved playing hide-and-seek | D．disliked the author's dad |
| A．She was treated as a member of the family. | B．She played games with anyone she liked. |
| C．She was loved by everybody she met. | D．She went everywhere with the family. |
【推荐2】Native to forests of Central and South America, glass frogs in the Centrolenidae family get their name from their skin and muscles that help them be perfectly fit to live in their jungle environment. Turn the frogs over, where the effect is the most impressive, and you’ll make out their hearts, livers, and other organs through their hyaline bellies (肚子).
And in a study published in the journal Science, researchers have discovered an amazing mechanism (机制) the animals use to become so clear.
When glass frogs go to sleep, they take in 89 percent of their brightly colored red blood cells into sacs (液囊) in their livers, which reflect incoming light and make the frogs appear nearly unseen. With their red blood cells out of view, the frogs become twice to three times more clear — a trick scientists believe helps the animals avoid being killed and eaten by their natural enemies.
“The trick is really hard to do, because their tissues are full of things that take in and spread light. And transparency (透明) is normal for many creatures in water, but hard on land,” says study co-author Jesse Delia. “Red blood cells also take in a lot of light, and we found that the frogs can actually hide themselves by packing them into the liver.”
Not only are the findings interesting, but the researchers attach great importance to them. That’s because many red blood cells in one place usually form a clot (血块), which can block and lead to a potentially life-threatening condition. But the frogs can seemingly clot and expand their red blood cells at will — without any negative effects. This may mean the animals already have what medical researchers have been seeking for decades: a biological mechanism which prevents too much bleeding while also preventing too much clotting.
1. What does the underlined word “hyaline” mean in paragraph 1?| A．See-through. | B．Powerful. |
| C．Narrow. | D．Good-looking. |
| A．The frogs fit in their environment better. |
| B．Sacs filled with red blood cells make the frogs clear. |
| C．Red blood cells in the frogs’ liver reflect light. |
| D．The frogs are able to take in a lot of bright colors. |
| A．Interesting. | B．Unusual. |
| C．Shocking. | D．Annoying. |
| A．They help cure serious diseases. | B．They are a blessing for wild animals. |
| C．They can lead to advances in medicine. | D．They will prevent all clotting and bleeding. |
【推荐3】Images of polar bears struggling to stay on rafts of ice are often used by groups that want to promote conservation and stop the deterioration of natural habitats. However, part of the solution lies with the polar bears themselves.
Polar bears are highly specialized. This means they have adapted to survive in a specific region and eat specific food. Polar bears live above the Arctic Circle and eat fish. Their bodies are different from those of other types of bears. Polar bears feature webbed feet for swimming, thicker fur and more body fat for living and swimming in icy conditions, and light-colored fur to help them blend into their environment. As a result, polar bears do not do well when they are in a non-arctic region. They cannot run as well as other bears, they can become too hot and tired easily, and they have a hard time hunting animals that are not in the snow or ice.
Unfortunately for polar bears, climate change is reducing the size of the areas where they can live. This means the bears will eventually have to leave the arctic regions and travel farther south. However, because they are so specialized, it is unlikely that polar bears will be as strong as they once were.
Other creatures, such as crocodiles, are not nearly as specialized. They live on almost every continent and in a wide variety of climates. In fact, crocodiles are one of the most adaptable animals on the planet and have survived for millions of years. When animals specialize, they often do better than less-specialized species in the same place, but if the climate or other conditions change, the specialized animals are usually the first to die off.
If polar bears are going to survive the next 100 years, they will have to adapt. Many scientists believe that polar bears may eventually cross paths with brown bears and black bears. Whether these animals fight it out or fall in love to create new generations of bears remains to be seen. No matter how it happens, many hope the polar bears will live far into the future－in many different places.
1. Which of the following is an effect of polar bear specialization?| A．Polar bears are not in danger of dying off. | B．Polar bears fight other bears for food. |
| C．Polar bears adapt to new habitats. | D．Polar bears hunt well in arctic areas. |
| A．the cause of climate change | B．the importance of adaptability |
| C．the history of biological evolution | D．the changes of natural environment |
| A．The color of their fur. | B．Their tendency to easily overheat. |
| C．Their more body fat and thicker fur. | D．Their ability to travel on ice rafts. |
| A．no longer exist | B．find a colder place to live in |
| C．live in the south of the Arctic Circle | D．act more like brown and black bears |
However, Halley had a friend named Isaac Newton, who was a brilliant mathematician. Newton thought he had already worked out that problem, but he could not find the papers on which he had done it. He told Halley that the orbit of a comet had the shape of an ellipse(椭圆形).
Now Halley set to work. He figured out(解决，计算出)the orbits of some of the comets that had been observed by scientists. He made a surprising discovery. The comets that had appeared in the years 1531, 1607, and 1682 all had the same orbit. Yet their appearance had been 75 to 76 years apart.
This seemed very strange to Halley. Three different comets followed the same orbit. The more Halley thought about it, the more he thought that there had not been three different comets as people thought. He decided that they had simply seen the same comet three times. The comet had gone away and had come back again.
It was an astonishing idea! Halley felt certain to make a prediction(预言)of what would happen in the future. He decided that this would appear in the year 1758. There were 53 years to go before Halley’s prediction could be tested. In 1758 the comet appeared in the sky. Halley did not see it, for he had died some years before. Ever since then that comet had been called Halley’s comet, in his honor.
1. Edmund Halley figured out the orbit of ____.
| A．some different comets appearing several times |
| B．the same comet appearing at different times |
| C．three different comets appearing at the same time |
| D．several comets appearing at the same time |
| A．by doing experiments |
| B．by means of his own careful observation |
| C．by using the working of other scientists |
| D．by chance |
| A．1704 | B．1705 | C．1706 | D．1707 |
| A．Halley and other scientists | B．the orbit of a comet |
| C．Newton and Halley | D．Halley and his discovery |
【推荐2】If you’re planning to go on a diet, or if you suffer from serious conditions like diabetes. Knowing exactly what and how much you’re eating is essential. In this day and age, we have calorie and nutrition calculators even on our smartphones, but they act only as guides, whereas a famous company’s revolutionary new device, CaloRieco, actually analyzes the food on your plate and provides accurate information in just a few seconds.
You’ve probably used caloric calculators before, and you know that they only offer general information. For example, a calculator will tell you the average number of calories in a hamburger. but it can’t tell you exactly how many calories are in the hamburger. The same goes for nutrients like protein or fat. And this is what makes the new CaloRieco so special.
The spokesman for the company said that its outstanding invention is aimed at dieters and diabetes sufferers, both of whom make up a sizable market. Displayed at a recent tech show, CaloRieco is a high-tech device that uses light reflection technology to determine the nutritional values of almost any food and also provide accurate calorie estimates. All you have to do is put your plate in the box-shaped device and wait between 10 and 20 seconds for it to analyze all the food.
Once it’s done analyzing the various ingredients in your meal, CaloRieco shows the number of calories, as well as the nutritional content on an LED display. According to the company the device is able to recognize the vast majority of foods, except soups and very dark dishes.
CaloRieco can also connect to your smartphone via an app, and send all the data about analyzed foods to your handheld device, so you can access it whenever you need.
Unfortunately, you’ll have to wait a bit longer to get your hands on your very own CaloRieco, as the device presented at the show is just a prototype(样机) which needs to be improved. It’s expected to be a hit in the next few years, but the price remains a mystery.
1. What is the advantage of CaloRieco?| A．It uses light reflection technology |
| B．It offers general information of food. |
| C．It is a high-tech device working as a guide. |
| D．It can present the exact calorie of analyzed food. |
| A．needs a long time to analyze the food. |
| B．can show the food data on the smartphone directly |
| C．can count the calories of all foods on your plate. |
| D．may be well received among dieters and diabetes sufferers |
| A．The smartphone. | B．The app | C．The data. | D．The food. |
| A．It’s perfect. | B．It’s promising. | C．It’s costly. | D．It’s available. |
【推荐3】The Intergovernmental Panel on Climate Change (IPCC) released a report. It stated that the world is quickly running out of time to keep global warming below 1.5 degrees Celsius, the level widely agreed to be the conservative, safety-first goal to prevent serious climate harm. To get there, the world would have to cut current emissions (排放物) by 45 percent by 2030. That sounds absurdly unlikely.
But before we give in to despair, we should remember that the technology to address climate change is going along at high speed. The largest source of US carbon emissions is transportation, and a Green New Deal program for motor vehicles would be quite straightforward.
The reason is simple: With some subsidies (补贴), electric cars and buses are cost- competitive with fossil-fuel vehicles. Electric buses have gone into the market at the greatest speed, because they are a logical choice for electrification. At the end of 2018, electric vehicles were displacing about 280,000 barrels of oil demand per day. That’s more than the whole consumption of Greece.
And the electric car market is also reaching maturity, with appealing designs, longer range, and a quickly-expanding rapid charging network in many countries. It’s worth emphasizing that most of the basic systems necessary to recharge electric vehicles already exist. People often tend to assume that we would need to replace every gas station, but virtually all homes and businesses already have an electrical connection which can be easily improved for fast charging. All that is needed to go fully electric is enough battery capacity and fast charging stations to deal with long trips.
Now America would have to repair its electricity production, rails, shipping, and so on to fully decarbonize (脱碳) the transportation sector. It will be considerably more difficult than simply rooting out fossil fuel vehicles from the market.
But greening America’s vehicles would be straightforward, relatively cheap, and a huge step forward on climate. The politics of climate change are so fearful that despair can seem logical, but the first step in achieving a tough goal is the firm belief that it can be done. And this particular step wouldn’t even be that tough.
1. What can we infer from the IPCC’s report?| A．The world is suffering serious climate harm. |
| B．Global warming is growing out of our control. |
| C．We are too conservative to deal with global warming. |
| D．Cutting emissions is the easiest way to stop climate change. |
| A．By running at the greatest speed. |
| B．By changing the way of transportation. |
| C．By making consumers have logical choices. |
| D．By getting financial support from governments. |
| A．They aren’t so efficient in reducing emissions. |
| B．There’s still much room for designing new ones. |
| C．There aren’t enough fast charging stations for them. |
| D．Home electrical connection can be used for charging them. |
| A．Doubtful. | B．Critical. | C．Positive. | D．Uncaring. |
