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The worldwide 20th century “Green Revolution”, which saw huge year-by-year increases in global grain yields (产量), was fueled by the development in the 1960s of new high-yielding dwarfed (矮小) varieties known as Green Revolution Varieties (GRVs).

These dwarfed GRVs are common all over the world in today’s wheat and rice crops. Because they are dwarfed, with short stems, GRVs devote relatively more resources than tall plants to the growth of grains rather than stems, and are less likely to suffer yield losses from wind and rain damage. However, the growth of GRVs requires farmers to use large amounts of nitrogen fertilizers (氮肥) in their fields. These fertilizers are costly to farmers and cause extensive damage to the natural environment. The development of new GRVs combining high yields with reduced fertilizer requirements is thus a global agricultural goal.

Researchers at the University of Oxford and the Chinese Academy of Science have discovered for the first time a gene that can help reach the goal. Comparing 36 different dwarfed rice varieties, the researchers identified a novel natural gene that helps increase the rate at which plants make use of nitrogen from the soil. This gene, called GRF4, can increase the amount of a protein (蛋白质) in plant cells. GRF4 is actually a promoter that encourages the activity of other genes—genes that promote nitrogen uptake (摄入). Professor Harberd said, “Increasing GRF4 levels could contribute to an increase in the grain yields of GRVs, especially at low fertilizer input levels.”

The researchers say the latest rice variety containing GRVs should now become a major target for farmers in increasing crop yields and fertilizer use efficiency, with the aim of achieving the global grain yield increases necessary to feed a growing world population at a reduced environmental cost. It is very urgent at the moment.

Professor Harberd added, “This study is an example of how studying fundamental science objectives can lead rapidly to potential solutions to global challenges. It shows how the discovery can enable chances for food security and future new green revolutions.”

【小题1】What can we know about dwarfed GRVs?
A.They have higher yield and taller stems.B.They are a “double-edged sword”.
C.They are environmentally friendly.D.They can be easily affected by weather.
【小题2】What does “the goal” in Paragraph 3 refer to?
A.Increasing the rate of nitrogen use.B.Producing cheaper nitrogen fertilizers.
C.Using fewer fertilizers to produce more grains.D.Finding a gene to solve agricultural problems.
【小题3】What can GRV directly do?
A.It promotes other genes’ activity.B.It increases the output of crops.
C.It takes in nitrogen from the soil.D.It lowers fertilizer input levels.
22-23高二下·陕西西安·期末
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Velcro is a hook-and-loop (粘扣的) device that is commonly found on a wide range of products, such as shoes, jackets, and a lot of other equipment in offices, kitchens, and garages. It’s also the name of the company that originally created the “thing”generally known as Velcro.

George de Mestral, a Swiss electrical engineer, is the inventor of Velcro. How he came to the idea of actually making this thing that we call Velcro is a truly incredible story.

One fine morning in 1948, Mestral went for a walk with his dog. After returning from the walk, he found that some seeds got stuck to the dog’s fur. However, the man’s attention was turned to his own trousers, where many similar seeds were also attached.

Upon closer examination, he noticed that there were many small hooks in the seeds that stuck firmly to the loops in the fabric of his trousers. The first idea for what would eventually become Velcro struck him like lightning. If he could artificially recreate the same thing, by making pairs of hooks-and-loops that stick to each other firmly, then there would be almost no need to tie things up all the time to secure them, nor would zippers, which were quite popular in those days, be necessary any longer. He decided to call the product he formed Velcro.

Like many inventions, Velcro also faced a great deal of criticism,but Mestral stood by his design and continued to make structural changes to enhance its bonding strength. He worked with a Frenchmah to come up with a perfect hook-and-loop device. Mestral patented Velcro in 1955.

Velcro didn’t do very well initially; much of that was due to its lack of aesthetic appeal. It came in dull colors and often looked quite “unattractive”. But soon, even NASA helped to boost Velcro’s image by using it in a lot of equipment that went into space along with astronauts.

【小题1】What can we know about Velcro according to the passage?
A.It’s been replaced by zippers.
B.It’s a nature-inspired product.
C.It’s an established shoe brand.
D.It’s a hook commonly used in offices.
【小题2】Which of the following best describes George de Mestral?
A.Talented.B.Considerate.C.Sympathetic.D.Innovative.
【小题3】How did the public originally react to Velcro?
A.They were critical of it.
B.They paid no attention to it.
C.They thought of it as a practical item.
D.They were dissatisfied with its function.
【小题4】What is the text mainly about?
A.A controversial device.B.A brilliant creation.
C.An unexpected discovery.D.An unforgettable experience.

Glass bottles have long conveyed (传递) a high-quality image for the wine they carry, but their carbon footprint is sizable. Fossil fuels are used to produce and recycle them. And when it comes to transport, they are also heavy and waste space.

“But Packamama, an Australian packaging start up, has launched a range of flat wine-bottles, the first for the country, promoting them as an environment ally-friendly alternative to traditional glass. The bottles are made from 100 % recycled PET plastic. The slim, flat profile (外形) is 83 % lighter, and allows twice as many bottles to fit into a standard case. “Australia is home to the two most significant successful wine packaging innovations of the last century. Bag-in-box and screw cap (螺旋瓶盖), both from the mid-1960 s,” says Santiago Navarro, Packamama’s co-founder.

Three months after the first bottles hit the shelves, the data suggests flat-bottled wines are becoming popular with drinkers. Packamarna’s first production order was for 65,000 units, a figure that has risen to 90,000. The demand was so strong that they were sold out after the first production. Questions remain, however, about the flat-profile bottle’s suit ability for high-quality wines. The wine maker Nicole Esdaile, of Cent are Vineyard in Victoria’s Yarra Valley, applauds the move but says it is not a workable option for her business, given its focus on classic, collectible wines typically exported to China. “Critically, they are not suitable for storing wine, with the recommended shelf life being no more than two years. The bottles are perfect for quick ‘drink-now’ style.”

The wine maker Tom Wallace wants to see how flat-bottled wines perform over the years ahead. “The priority for us is the quality of the wine going in, so the packaging has to reflect that and allow those wines to mature (酿成) in the best way possible. We will wait and see how the trials and research go before we jump on board.”

【小题1】What advantage do the flat wine-bottles have over glass bottles?
A.They can be recycled.B.They offer zero carbon footprint.
C.They save space in transport.D.They indicate good wine quality.
【小题2】Why does Santiago Navarro mention the two innovations of the last century?
A.To express his pride in his country.B.To explain his interest in innovations.
C.To show his confidence in his products.D.To display his knowledge in packaging.
【小题3】What is the weakness of the flat wine-bottles?
A.They have a short shelf life.B.They are hard to produce in mass.
C.They fail to meet Chinese standards.D.They are prohibited from being exported.
【小题4】What does the underlined phrase “jump on board” mean in the last paragraph?
A.Ship bottled wines.B.Use the new packaging.
C.Quicken the process of maturing.D.Produce flat wine-bottles.

Amazon has plans to drop off packages directly into shoppers’ houses. The world’s largest online retailer has announced Amazon Key, a lock and camera system that users control remotely to let delivery associates (伙伴) put goods into their houses. Customers can create temporary passwords (密码) for friends and other service professionals to enter as well.

The smart lock may help Amazon get sales from shoppers who cannot make it home to receive an order, and don’t want the package stolen from their doorstep. It also signals Amazon’s determination to win the market of home security devices, where Alphabet Inc.’s Nest Labs competes.

“This is not an experiment for us,” said Peter Larsen, Amazon vice president of delivery technology, in an interview. “This is a key part of the Amazon shopping experience from this point forward.”

Members of Amazon’s Prime shopping club can pay $249.99 and up for a cloud­controlled camera and lock that the company offers to install. Delivery associates are told to ring a doorbell or knock when they arrive at someone’s house. If no one greets them, they press “unlock” in a mobile app, and Amazon checks its systems in an instant to make sure the right associate and package are present. The camera then streams the video to the customer who remotely can watch the in­home delivery take place. The associate cannot proceed with other trips until the house is again locked.

It is unclear whether such protections will persuade customers that the service is safe to use. Larsen said stealing was “not something that happens in practice”, based on early tests of the Amazon Key program. He added that if a problem arises, “You can call customer service and Amazon will work with you to make sure it’s right, reimbursing (赔偿) you for any loss or damage in some cases.”

【小题1】What can we learn about the Amazon Key?
A.It has a limited use.
B.It can prevent stealing in reality.
C.It has been accepted by customers.
D.It plays an important in Amazon’s market planning.
【小题2】Who will be the customers to buy the smart lock?
A.Those who entertain guests at home.
B.Those who often buy things on Amazon.
C.Those who can’t receive the package in person.
D.Those who care about home safety very much.
【小题3】What should delivery associates do first to start the lock?
A.Make sure there is no one at home.
B.Install the lock for the customers.
C.Connect the lock to a camera.
D.Press “unlock” in a mobile app.
【小题4】In which section of a newspaper may this text appear?
A.Entertainment.B.Technology.
C.Education.D.Lifestyle.

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