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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.”

【小题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.
【小题2】What’s the advantage of the new material over plastic?
A.Highly-effective.B.Environment friendly.
C.Low-cost.D.Easy-to-produce.
【小题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.
【小题4】Which section of a website does the text probably belong to?
A.Fashion.B.Health.
C.Science.D.Environment.
21-22高一上·辽宁沈阳·期中
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“Creativity is the key to a brighter future,” say education and business experts. Here is how schools and parents can encourage this important skill in children.

If Dick Drew had listened to his boss in 1925 , we might not have the product that we now think of as great importance: a new type of tape. Drew worked for the Minnesota Mining and Manufacturing Company. At work he developed a kind of material strong enough to hold things together. But his boss told him not to think more about the idea. Finally, using his own time, Drew improved the tape, which now is used everywhere by many people. And his former company learned from its mistake. Now it encourages people to spend 15 percent of their working time just thinking about and developing new ideas.

Creativity is not something one is just born with, nor is it necessarily a character of high intelligence. The fact that a person is highly intelligent does not mean that he uses it creatively. Creativity is the matter of using the resources one has to produce new ideas that are good for something.

Unfortunately, schools have not tried to encourage creativity. With strong attention to test results and the development of reading, writing and mathematical skills, many educators give up creativity for correct answers. The result is that children can gain information but can’t recognize ways to use it in new situations. They may know the rules correctly but they are unable to use them to work out practical problems.

It is important to give children choices. From the earliest age, children should be allowed to make decisions and understand their results. Even if it’s choosing between two food items for lunch, decision­making helps thinking skills. As children grow older, parents should try to let them decide how to use their time or spend their money. This is because the most important character of creative people is a very strong desire to find a way out of trouble.

【小题1】We can know from the passage that creativity is ______.
A.something that most people are born with
B.something that has nothing to do with intelligence at all
C.a way of using what one has learned to work out new problems
D.something that is not important to the life in the future at all
【小题2】Why don’t schools try to encourage creativity?
A.They don't think creativity education is important.
B.They don't want their students to make mistakes.
C.They pay no attention to examination marks.
D.They think it impossible to develop creativity in class.
【小题3】What should parents do when their children decide how to spend their money?
A.Allow them to have a try.
B.Try to help them as much as possible.
C.Take no notice of whatever they do.
D.Order them to spend the least money.
【小题4】What did the company where Drew once worked learn from its mistake?
A.It should encourage people to work a longer time.
B.People should be discouraged to think freely.
C.People will do better if they spend most of their working time developing new ideas.
D.It is necessary for people to spend some of their working time considering and developing new ideas.

Scientists claim to have developed a revolutionary new giant 3D concrete printer that can build a 2,500-square-foot house in just 24 hours.

The 3D printer, developed by Professor Behrokh Khoshnevis from the University of Southern California, could be used to build a whole house, layer by layer, in a single day.

"It is basically scaling up 3D printing to the scale of building," said Khoshnevis.

The giant robot replaces construction workers with a nozzle (喷嘴), which can quickly build a home based on a computer pattern, MSN News reported.

Contour Crafting, as it is named, is a layered fabrication (构造) technology. Using this process, a single house or a colony of houses, each with possibly a different design, may be constructed in a single run, embedded (嵌入) in each house all the wires and pipes for electrical, plumbing and air-conditioning.

The potential applications of this technology are far-reaching including in emergency, low-income, and commercial housing.

"Our research also addresses the application of Contour Crafting in building habitats on other planets. Contour Crafting will most probably be one of the very few feasible approaches for building structures on other planets, such as the Moon and Mars, which are being targeted for human habitation before the end of the new century," researchers said on the project website.

The technology may potentially reduce energy use and emissions. And the main advantages of the Contour Crafting process over existing technologies are the superior surface finish that is realized and the greatly increased speed of construction.

【小题1】Professor Khoshnevis has recently developed a 3D printer that can ________.
A.build a 2500-square-foot house in a single day
B.construct a skyscraper, layer by layer
C.design a group of houses automatically
D.assist construction workers in their work
【小题2】The new 3D printer uses the following to build a house EXCEPT ________.
A.a nozzleB.a computer patternC.a robotD.an air-conditioner
【小题3】According to the text, the potential applications of Contour Crafting include building _______.
A.emergency vehiclesB.low-income housing
C.commercial centersD.space stations on other planets
【小题4】What advantages of this new technology is mentioned in the text?
A.It creates more jobs.B.It is less time-consuming.
C.It saves the building cost.D.It emits no carbon dioxide.

Crime fighters could have a new tool at hand. Researcher have developed a cutting-edge technique to identify human hair. Their test is quicker than DNA analysis techniques currently used by law enforcement.

DNA testing is commonly used for identification because DNA is unique to each individual(个体). However, environment and chemical processes can degrade DNA, limiting its usefulness over time. Protein(蛋白质) in hair, on the other hand, is more stable than DNA but can also have variations(变异体) that may be unique to be the individual.

“Our analysis process can be used universally,” says Ms. Huang. “One of our samples(样本) even included dyed hair and the test was 100 per cent accurate. The test was able to distinguish East Asians, Caucasians and South Asians.”

Dr. Beauchemin says she has got in touch with law enforcement agencies about using the new technology. She is also planning to collect more hair samples and continue her research with a goal of finding where exactly in the world the hair sample is form, to look for more races and determine specific age.

“We are in a very similar place with protein-based identification to where DNA testing was during the early days of its development,” said chemist Brad Hart.” This method will be a game-changer, and while we’ve made a lot of progress toward improving it, there are steps to go before this new technique is able to reach its full potential.”

【小题1】What’s the main purpose of the text?
A.To analyze crime scenes.
B.To distinguish different races.
C.To show the usefulness of DNA testing.
D.To introduce a new identification method.
【小题2】Which will be the most useful in identifying a person according to Brad Hart?
A.Chemical materials.B.protein in hair.
C.DNA variations.D.Blood sample.
【小题3】What’s the advantage of the protein-based identification over DNA testing?
A.Stability.B.Popularity.
C.Security.D.Convenience.
【小题4】What can be inferred from the last paragraph of the test?
A.DNA testing will soon reach its full potential.
B.Protein-based identification remains to be improved.
C.Protein-based identification has replaced DNA testing.
D.DNA testing develops as rapidly as protein-based identification.

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