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题型:阅读理解-阅读单选 难度:0.65 引用次数:48 题号:14359182

From raindrops in the Rockies to the very food on our plates, we’ve woven a complicated web for ourselves out of plastic. It’s strong and flexible and cheap. It’s also a great danger for the planet, though.

But new research from Aalto University and VTT Technical Research Centre of Finland suggests there may be a way to deal with this mess—with a little help from spiders, and our environmental heroes, trees.

In a paper published this month in Science Advances, the scientists claim to have developed a new material by sticking cellulose (纤维素) fibers from wood to the silk protein found in spider webs. The result? A strong, flexible material that could do everything plastic does better — except, of course, block up the planet. In other words, they dug into nature’s cookbook to combine just the right ingredients to create a material that does all things plastic does — but what matters most is that, since it’s entirely biodegradable (可生物降解的), it goes back to nature when its job is done.

The bio-material is so effective, researchers are consider using it as a possible replacement for plastic in everything from the medical and textile industries to packaging. Then, how many hard-working spiders would we need to increase its production to that of plastic? For their research, the Finnish scientists didn’t use a single thread of spider silk, but rather produced webbing from bacteria with synthetic (合成的) DNA.

“Because we know the structure of the DNA, we can copy it and use this to produce silk protein molecules (分子) which are chemically similar to those found in spider web threads,” lead researcher Markus Linder of Aalto University explains in the release. “The DNA has all this information contained in it.”

1. Why do the researchers develop the new material?
A.To find a cheaper way to produce plastic.
B.To make the web woven out of plastic stronger.
C.To make better use of the silk protein from spiders.
D.To solve the mess caused by using too much plastic.
2. What’s the advantage of the new material over plastic?
A.Highly-effective.B.Environment friendly.
C.Low-cost.D.Easy-to-produce.
3. What makes it possible to increase the production of the new material?
A.Using synthetic DNA.B.Raising plenty of spiders.
C.Planting lots of trees.D.Introducing hard-working spiders.
4. Which section of a website does the text probably belong to?
A.Fashion.B.Health.
C.Science.D.Environment.
【知识点】 发明与创造 说明文

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【推荐1】The world’s first robotic self-portraits (自画像), painted by an robot called Ai-Da, have been displayed at a new art exhibit in London. The surprisingly accurate images question the role of artificial intelligence (AI) in human society and challenge the idea that art is totally a human trait (特征), according to her creators.

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Three of these robot selfies went on display at the Design Museum on May 18 in an exhibition titled “Ai-Di: Portrait of the Robot,” which is free to the public and will remain on display until Aug. 29.

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1. What is special about the displayed self-portraits by Ai-Da?
A.It features surprising images.
B.It challenges traditional crafts.
C.It poses academic questions.
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2. Why are three robot selfies displayed at the Design Museum?
A.To enhance Ai-Da’s sense of achievement.
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C.To raise money for creating abstract paintings.
D.To arouse people s reflection on the role of technology.
3. What can be inferred about Ai-Da from the last paragraph?
A.She helps creators make decision.
B.She is trained in photo techniques.
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D.She is programmed to auto updates.
4. What is the best title for the text?
A.The Far reaching Impact of Art
B.The Essential Role of High-tech
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