Look into hunters' eyes

    Have you ever been face to face with a cat or a sheep? If you have,you probably noticed that cats narrow their eyes to vertical (垂直的) slits (狭缝),while sheep have horizontal pupils (瞳孔).

     Why is the difference?

    Scientists from the Universities of California Berkeley and Durham in Britain may have the answer. Their research, published recently in the journal Science Advances, suggested that pupils' shapes could tell whether an animal is a hunter or gets hunted.

    The researchers took a close look at the eyes of 214 land animals.The challenge was to see if they could find a relationship between an animal's role in the food chain and the pupils' shapes.

    They found a pattern. Species with pupils that are vertical slits are more likely to be small ambush predators (捕猎者) – creatures that lie in wait for their lunch.In contrast,those with horizontal pupils are more likely to be plant-eating prey (猎物) species.

    Evolution chose the arrangement for a good reason.For hunters such as household cats,it appears that vertical pupils not only improve their ability to keep track of moving objects like mice,but also maximize (使最大化) their ability to judge the distances of the animals they hunt.

    However, an interesting discovery from the study is that the slit pupils are mostly linked to hunters that are close to the ground. Therefore, bigger cats who actively hunt down their prey, like tigers and lions, don't have slit pupils.

    On the other hand, for plant-eating prey animals, horizontal pupils give them a wider field of vision.When stretched (伸展) horizontally,the pupils allow for more light to enter from the front, back, and sides. Meanwhile, they also limit the amount of light from the sun above so the animal can see the ground better.“ Once they do find a predator,they need to see where they are running,” said leading researcher Martin Banks,a UC Berkeley professor of optometry (视光学).“They have to see well enough out of the corner of their eye to run quickly and jump over things.”

    But what happens when they bend down to eat? Researchers checked this by watching prey animals in the Oakland Zoo in California, US. They believe that when goats lower their heads to eat,their eyes rotate (旋转) to keep their pupils horizontal.

    So it seems that the eyes are indeed the window to the soul!

Rich and Famous

    Twenty years ago the most common ambition of American children was to be a teacher, followed by working in banking and finance, and then medicine. But today's situation is quite different. {#blank#}1{#/blank#} Instead they most commonly say they want to be a sports star, or an actor—in other words, they hope to become a celebrity.

    According to experts, young people desire these jobs largely because of the wealth and the fame. {#blank#}2{#/blank#} Let's take athletes and singers as an example. Their careers are short-lived. Many athletes' best time only lasts a few years and singers can have a very limited career. The field that was once the focus of their lives becomes something they have little or no involvement in. As a result, they'll have a feeling of worthlessness and a lack of control. {#blank#}3{#/blank#} The truth is quite simple: they have been so far removed from it for so long.

    In spite of these disadvantage, there is greater ambition than ever among young people to achieve that status. They are not satisfied just making a living—they want to be rich and famous. Globally, more and more TV shows provide talent competitions where winners can achieve their goals in just a few weeks or months. {#blank#}4{#/blank#} They unrealistically believe that this lifestyle is easily obtained and leads to great satisfaction.

    While many people argue that there is nothing wrong with having such ambitions, others feel that this trend will finally lead to dissatisfaction as more and more people are unable to reach their goals. {#blank#}5{#/blank#} That means they ignore the simple fact that great effort is needed before success. As a result, many people won't realize their childhood dreams, which could have a negative effect on their happiness.

A. The younger generation don't favor these professions any more.

B. In many ways this has been brought about by the celebrity culture.

C. Unfortunately, they do not always have a positive effect on people's life.

D. Besides, it can be difficult for them to adapt back to a normal everyday life.

E. People no longer have a sense of satisfaction once their goals have been achieved.

F. This quick way of gaining wealth and fame creates a celebrity culture among people.

G. The reason is that they don't realize it takes talent and hard work to be rich and famous.

    From the first use of the rocket to carry satellites into space to the setting up of space stations, human beings have been putting great effort into space research. And so far, we have achieved many successes. But there are still numerous tasks in front of us and we should not stop trying to progress.

    The international space station （ISS） is an important step we should take in space exploration. It is not only helpful but also essential. It provides a proper space environment for many experiments that we have wanted to do for a long time. It is also a base for the observations of the earth and the universe. It could also be an important base for later travel to the moon and Mars. In a word, if we want to explore space more, the first thing we should do is to set up a space station.

    As the space station costs a lot of money, it is hard for one country alone to establish one. The USA seem to be the only country that has the ability to build a space station alone, and it has tried to do so, but not very successful. So it aggregated many other countries to work on it together. Though it is still extremely expensive, it is much cheaper than doing it alone. It is really a job that needs everyone's effort and will benefit everyone.

    Led by the U. S. and Russia, the ISS is a joint project between six space agencies involving 16countries. Called the greatest achievement in human cooperation, the ISS has come to the end of a ten﹣year's hard work in construction. China has applied for participation in （taking part in） the project many times. Unfortunately all the applications were rejected, which drove China onto the path of independent development. As the Long March Ⅱ﹣F/T1 carrier rocket blasted off （leave the ground） and successfully carried the Tiangong﹣1into space on September 29, 2011, China takes a big step toward its Space Station Era.

    Some West media suggested that the successful launch of Tiangong﹣1 would disturb the balance of global space power, raising concerns about "China threat". China's space project is not designed for military purpose but for developing space technology to explore space resources and make use of them for mankind's well﹣being.

    Whether you use a GPS device (设备) in your car or Google Maps on your smartphone, few of us travel anymore without digital help. {#blank#}1{#/blank#} For one thing, GPS isn't as accurate as you might think. What's more, science is beginning to discover that people who rely only on navigational technologies may have a poor sense of place during travel.

    {#blank#}2{#/blank#} They soon become outdated as cities change, requiring users to continually purchase updated versions. They're also easily damaged from exposure to water, poor weather conditions and other physical forces.

    However, paper maps still offer a few advantages that technologies can't. For example, studying a map allows you to get a full view of where you're going, including the roads, forests, towns, historic sites, rivers and mountains you'll come across along the way. Many older maps are wonderful, offering a lovely feast for the eyes. {#blank#}3{#/blank#}

    Research by Toru Ishikawa and colleagues at the University of Tokyo found that GPS users spent 30％ more time looking at their device than those who used a paper map. {#blank#}4{#/blank#} Instead they tended to stare at their screens and follow directions, never gaining a full view of where they were going.

    Therefore, go ahead and use your GPS, but also carry a paper map as a handy backup. {#blank#}5{#/blank#} Also it could even be a life-saver!

    Tablets(平板电脑) are useful devices, but their big screens always make them as a burden to carry around without a bag. Wouldn't it be great if there were a phone with the powers of a tablet that could be folded up and fit neatly into the hand? Now something like a tablet-shaped but foldable(可折叠的) phone is about to become available. In February, Samsung and Huawei both introduced foldable phones, the Galaxy Fold and Huawei Mate X separately, to the public for the first time. Mobile phone use has entered the "foldable future", the Verge noted.

    The technology could change our lives in significant ways. These devices, due to their bendable screens, give us the larger screens we want but still fit easily into the pocket. The technology could change other devices too. For example, we could make TVs that stick to walls like posters, or fold up easily to hide away in drawers, which could help increase available space to the maximum. In a keynote address, Justin Denison, Samsung's senior vice president, called the foldable screen "the basis for the smartphone of tomorrow". "It's a blank canvas (画布) for us to do something beautiful together," he said.

    So is there nothing to stand in the way of the foldable future? According to tech news website Android Authority, the necessary displays were difficult to produce. In 2012, nine out of ten foldable screens produced were defective or unusable. Today, that 10 percent rate has been improved to almost 90 percent. However, at present these foldable devices are expensive. For example, the price of Huawei Mate X is 17, 500 RMB. That's a price that few people will be able to afford.

    But if the foldable device isn't going to change the world overnight, there is no doubt that it is coming. Patrick Moorhead, an industry expert told The Verge, "Few are debating if foldable mobile displays are the future of smartphones; the only question is when and by whom."

A 50- minute drive northwest of downtown Beijing, pops up a village, {#blank#}1{#/blank#} houses a shadow puppetry troupe(皮影戏剧团) and a theater, Beijing Long Zaitian Shadow Puppetry Theater. 

Shadow puppetry {#blank#}2{#/blank#}( see) as the prequel(前篇) to film and animation in China. In2011, the art landed a spot on the UNESCO Intangible Cultural Heritage List. 

Besides performances {#blank#}3{#/blank#}( create) by light and shadow, performers must master multiple skills as the plays combine painting, carving, opera {#blank#}4{#/blank#} literature. However, due to low income and a small market, few young people are willing {#blank#}5{#/blank#} ( learn) shadow puppetry. 

This particular troupe, however, stands out from the crowd: Average performer age is only 25. Moreover, of the 300 performers it has trained over the years, many are under 1. 4m in {#blank#}6{#/blank#} ( high). 

In 2006, Wang Xi, inheritor of Beijing Western- School Shadow Puppetry, {#blank#}7{#/blank#}( establish) the troup e in Beijing, and {#blank#}8{#/blank#} first four very short persons joined her two years later. After a four- month training, they picked up basic performance skills and started working in the theater. 

In 2021, the team designed Winter Olympics- themed shadow puppets. The puppets were gifted to foreign athletes during the Games. The troup e also staged {#blank#}9{#/blank#}( variety) plays introducing ice and snow sports through fairy tales. 

" We are lucky to have these people. They have been devoted {#blank#}10{#/blank#} the inheritance of shadow puppetry for over a decade, " Wang Xi said.