1 . Blind people have long desired for brightness, but scientists don’t have the technology. To bring that one step closer to reality, Zhiyong Fan, a materials scientist of the Hong Kong University of Science and Technology, developed a new artificial eye recently. The device, which is about as sensitive to light and has sharper vision and a faster reaction time than a real eyeball, may outperform human eyes.
The human eye owes its wide field of view and clear eyesight to the retina (视网膜) — an area at the back of the eyeball covered in light-detecting cells. The design for a new artificial eye is based on the structure of the human eye and uses a friendly light-sensitive material. At the back of the eyeball, an artificial retina is lined with Nan scale light sensors (纳米级光感器). Those sensors measure light that passes through the lens (晶状体) at the front of the eye. Wires attached to the back of the retina send signals from those sensors to the processor, similar to the way nerve networks connect the eyeball to the brain.
“In the future, we can use this to replace damaged human eyes,” says the lead designer. In theory, this artificial eye could see more clearly than the human eye, because the artificial retina contains about 460 million light sensors per square centimeter while a real retina has about 10 million light-detecting cells per square centimeter. Besides, the artificial eyeball records changes in lighting faster than human eyes can — within about 30 to 40 milliseconds, rather than 40 to 150 milliseconds. Although its 100-degree field of view isn’t as broad as the150 degrees a human eye can take in, the device can see as well as the human eye in poor light.
Hongrui Jiang, an electrical engineer at the University of Wisconsin, though, thinks engineers need a much more practical and efficient way to produce vast series of tiny wires on the back of the artificial eyeball to give it superhuman sight, which is super hard to achieve.
1. Why does Zhiyong Fan develop the artificial eye?| A．To replace people’s real eyeballs. | B．To gain a sharper vision. |
| C．To help the blind regain their eyesight. | D．To help normal eyes perform better. |
| A．The design of the artificial eye. | B．The structure of the human eye. |
| C．The advantages of the artificial eye. | D．The material used for the artificial eye. |
| A．They have the same structure. |
| B．The artificial eye may see more clearly. |
| C．The human eye sees better in weak light. |
| D．The artificial eye takes in a broader view. |
| A．Doubtful. | B．Favorable. | C．Unconcerned. | D．Satisfied. |
Celadon(青瓷),
The formation of each celadon is a process of life casting. Only after being burnt at around 1300℃ for 400 hours can it be made into an object. The
3 . People generally like to pick out the best-looking fruits and vegetables when shopping for produce (农产品), but Canadian supermarket chain Loblaws is attracting customers with badly-shaped and faulty produce at the price of 30% lower than normal-looking one.
A trial run of the ugly food line, named “Naturally Imperfect”, began with only apples and potatoes to choose from. Consumer demand has been so huge that Loblaws is going to introduce more ugly vegetables and fruits like onions and mushrooms.
All the produce that will be sold through Naturally Imperfect would otherwise have been used in juices, sauces, or soups, or have not been harvested at all. The director Dan Branson explained that this program benefited both food producers who would otherwise have to let abnormal produce go to waste, and consumers who could buy fresh produce at low prices. And he was right, given how popular the line has become.
“It really went well beyond our expectation,” Branson said. “I think it really spoke to the fact that Canadians are out there really looking for some options.”
Of course, Canadians know that beauty is more than skin deep, and they also recognize that they can get the same flavor and nutritional benefits in spite of appearances. The positive response to the initial offering of apples and potatoes showed the opportunity to expand the line and offer more options at a greater price to Canadian families.
“If you grow produce in your backyard, there will be a lot of produce that won’t look as pretty as what you will see in a grocery store”, said Branson. “And nature doesn’t grow everything perfectly. I’d like to think if somebody were to take a No Name Naturally Imperfect apple, put it right beside a No.1 apple, close his eyes and eat them, there would be no difference.”
1. Loblaws is different from other supermarkets in that ______.| A．more fruits are offered at lower prices | B．normal-looking produce is forbidden there |
| C．only apples and potatoes are sold every day | D．imperfect produce is sold at lower prices there |
| A．prevents people from wasting their food | B．happens to be a win-win mode |
| C．teaches food producers how to grow | D．enables consumers to eat more fresh produce |
| A．Canadians are used to eating perfect produce. |
| B．Smart consumers know the importance of ugly produce. |
| C．Loblaws intends to improve customers’ quality of life. |
| D．Customers’ support promotes the development of the ugly food line. |
| A．Imperfect fruits are as tasty and nutritious as perfect ones. |
| B．The world is usually full of imperfect things. |
| C．We should eat imperfect apples with our eyes closed. |
| D．The fruits grown by ourselves are more nutritious than those in the store. |
4 . Some of the world’s most famous musicians recently gathered in Paris and New Orleans to celebrate the first annual International Jazz Day. UNESCO (United Nations Educational, Scientific and Cultural Organization) recently set April 30 as a day to raise awareness of jazz music, its significance, and its potential as a unifying (联合) voice across cultures.
Despite the celebrations, though, in the U.S. the jazz audience continues to shrink and grow older, and the music has failed to connect with younger generations.
It’s Jason Moran’s job to help change that. As the Kennedy Center’s artistic adviser for jazz, Moran hopes to widen the audience for jazz, make the music more accessible, and preserve its history and culture.
“Jazz seems like it’s not really a part of the American appetite,” Moran tells National Public Radio’s reporter Neal Conan. “What I’m hoping to accomplish is that my generation and younger start to reconsider and understand that jazz is not black and white anymore. It’s actually color, and it’s actually digital.”
Moran says one of the problems with jazz today is that the entertainment aspect of the music has been lost. “The music can’t be presented today the way it was in 1908 or 1958. It has to continue to move because the way the world works is not the same,” says Moran.
Last year, Moran worked on a project that arranged Fats Waller’s music for a dance party, “Just to kind of put it back in the mind that Waller is dance music as much as it is concert music,” says Moran. “For me, it’s the recontextualization. In music, where does the emotion lie? Are we, as humans, gaining any insight (感悟) on how to talk about ourselves and how something as abstract as a Charlie Parker’s record gets us into a dialogue about our emotions and our thoughts? Sometimes we lose sight that the music has a wider context,” says Moran, “so I want to continue those dialogues. Those are the things I want to foster.”
1. Why did UNESCO set April 30 as International Jazz Day?| A．To remember the birth of jazz. | B．To protect cultural diversity. |
| C．To encourage people to study music. | D．To recognize the value of jazz. |
| A．Jazz becoming more accessible. | B．The production of jazz growing faster. |
| C．Jazz being less popular with the young. | D．The jazz audience becoming larger. |
| A．It will disappear gradually. | B．It remains black and white. |
| C．It should keep up with the times. | D．It changes every 50 years. |
| A．In a newspaper. | B．In a travel guide. |
| C．In a math textbook. | D．In a fiction novel. |
| A．Quiet. | B．Big. | C．Noisy. |
1. 阐述勤奋的意义；
2. 举一个勤奋促使你成功的事例；
3. 描述成功后的感受。
注意：
1. 词数100左右；
2. 题目已为你写好。
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1. 活动目的；
2. 活动过程；
3. 活动反响。
注意：1. 写作词数应为80左右；
2. 请按如下格式在答题卡的相应位置作答。
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1. 减少对电子产品的依赖；
2. 养成练书法的习惯。
注意: 1. 词数100 左右；
2. 可适当增加细节, 以使行文连贯。
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1．指出不文明现象；2．你的建议；3．活动的意义。
注意：1．写作词数应为80左右；2．请按如下格式在答题卡的相应位置作答。
Dear friends,
Nowadays, a great many holiday makers go out for sightseeing and relaxation.
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That’s all. Thank you for your listening.
| A．Terrible. | B．Worthless. | C．Great. |
