To address the plastic pollution troubling the world’s seas and waterways, Cornell University chemists have developed a new polymer (聚合物) that can degrade (降解) plastic when exposed to ultraviolet radiation, according to the research published in the Journal of the American Chemical Society.
“We have created a new plastic that has the mechanical properties required by commercial fishing gear. If it eventually gets lost in the water environment, this material can degrade on a realistic time scale,” said lead researcher Bryce Lipinski, professor of chemistry and chemical biology at Cornell University. “This material could effectively reduce persistent plastic accumulation in the environment.”
Commercial fishing contributes to about half of all floating plastic waste that ends up in the oceans. Fishing nets and ropes are primarily made from three kinds of polymers, none of which easily degrade. “While research of degradable plastics has received much attention in recent years,” Lipinski said, “obtaining a material with a mechanical strength comparable to commercial plastic remains a difficult challenge.”
Coates and his research team have spent the past 15 years developing the new plastic called isotactic polypropylene oxide, or iPPO. While its original discovery was in 1949, the mechanical strength of this material was unknown before this recent work. The high isotacticity and polymer chain length of their material makes it different from previous plastics and provides its mechanical strength.
Lipinski and other scientists want no race of the polymer to be left in the environment. He notes there is precedent (先例) for the biodegradation of small chains of iPPO which could effectively make it disappear and ongoing efforts aim to prove this.
1.What is the feature about the new polymer?
A.It can solve the problem of plastic consumption.
B.It can degrade plastic waste in the sea water.
C.It has been developed to solve plastic pollution.
D.It has been developed to lower fishing costs.
2.What can we infer from paragraph 3?
A.It requires great effort to invent the new plastic.
B.Fishing should be forbidden in the sea.
C.Fishing nets and ropes are not the major pollution source.
D.Degradable plastics were not paid attention to until recent years.
3.What did the recent study find about iPPO?
A.Its original discovery. B.Its mechanical properties.
C.Its complex structure. D.Its mechanical strength.
4.What is Lipinski’s attitude towards the future of iPPO?
A.Doubtful. B.Promising.
C.Unconcerned. D.Disapproval.
高三英语阅读理解中等难度题
To address the plastic pollution troubling the world’s seas and waterways, Cornell University chemists have developed a new polymer (聚合物) that can degrade (降解) plastic when exposed to ultraviolet radiation, according to the research published in the Journal of the American Chemical Society.
“We have created a new plastic that has the mechanical properties required by commercial fishing gear. If it eventually gets lost in the water environment, this material can degrade on a realistic time scale,” said lead researcher Bryce Lipinski, professor of chemistry and chemical biology at Cornell University. “This material could effectively reduce persistent plastic accumulation in the environment.”
Commercial fishing contributes to about half of all floating plastic waste that ends up in the oceans. Fishing nets and ropes are primarily made from three kinds of polymers, none of which easily degrade. “While research of degradable plastics has received much attention in recent years,” Lipinski said, “obtaining a material with a mechanical strength comparable to commercial plastic remains a difficult challenge.”
Coates and his research team have spent the past 15 years developing the new plastic called isotactic polypropylene oxide, or iPPO. While its original discovery was in 1949, the mechanical strength of this material was unknown before this recent work. The high isotacticity and polymer chain length of their material makes it different from previous plastics and provides its mechanical strength.
Lipinski and other scientists want no race of the polymer to be left in the environment. He notes there is precedent (先例) for the biodegradation of small chains of iPPO which could effectively make it disappear and ongoing efforts aim to prove this.
1.What is the feature about the new polymer?
A.It can solve the problem of plastic consumption.
B.It can degrade plastic waste in the sea water.
C.It has been developed to solve plastic pollution.
D.It has been developed to lower fishing costs.
2.What can we infer from paragraph 3?
A.It requires great effort to invent the new plastic.
B.Fishing should be forbidden in the sea.
C.Fishing nets and ropes are not the major pollution source.
D.Degradable plastics were not paid attention to until recent years.
3.What did the recent study find about iPPO?
A.Its original discovery. B.Its mechanical properties.
C.Its complex structure. D.Its mechanical strength.
4.What is Lipinski’s attitude towards the future of iPPO?
A.Doubtful. B.Promising.
C.Unconcerned. D.Disapproval.
高三英语阅读理解中等难度题查看答案及解析
We’re drowning in plastic. If you want to reduce your own contribution to the plastic pollution problem, recycling might seem like an easy solution.
But what happens after you clean out those plastic containers and pour them into a recycling bin? Unfortunately, the outcome isn’t as rosy as many people think; recycling is unlikely to give plastic to-go containers new life. “Of all the waste produced in 2017, only 8.4% of it eventually got recycled. It’s not that consumers aren’t motivated to recycle or that they don’t have ready access to recycling programs; the United States simply doesn’t have the proper facilities (设施),” said John Hocevar, a marine biologist with Greenpeace USA.
A recent report surveyed the United States’ 367 materials recovery facilities—the facilities that sort our recycling—and found only plastic bottles were regularly recycled. The fate of most other types of plastic such as packaging usually ends up being buried or burnt.
Not all plastic is created equal. If you turn over a transparent plastic bottle, like those used to hold water, you’ll notice a number “1” inside a triangular recycling symbol. Non-transparent jugs, like the kind that hold milk, get a “2”. At materials recovery facilities, or MRF’s, plastics get sorted based on these numbers, which indicate how recyclable they are.
Numbers 1 and 2 are relatively recyclable. Recycling gets more difficult with higher numbers, called “mixed plastic”. This waste makes up around 69% of all the plastic we use. It’s much more expensive to process than numbers 1 and 2.
So what the United States needs is facilities equipped to process other kinds of plastic. But Hocevar came up with a different solution: “The really simple answer is that we have to stop making so much throwaway plastic.”
That said, is recycling worth it? For bottles labeled (贴标签) “1” or “2”, the answer is “yes”. There’s also a growing market for plastics labeled “5”. For other numbers, Hocevar’s answer was simple: a resounding (响亮的) “no” on numbers 3, 4, 6 and 7.
1.Which problem is the USA facing according to the text?
A.People don’t know the best way to recycle.
B.Ready recycling programs are not accessible.
C.People lack awareness about plastic recycling.
D.There isn’t suitable equipment for plastic recycling.
2.What may John Hocevar think of plastic recycling in the USA?
A.Productive. B.Promising.
C.Unsatisfying. D.Controversial.
3.What information can the numbers on plastic bottles convey?
A.Whether it is easy to recycle them.
B.The recycling technology they need.
C.They places where they were produced.
D.Which dustbin we should put them into.
4.What should we do with plastic according to Hocevar?
A.Give up the use of plastic.
B.Develop more cheaper facilities.
C.Only recycle plastics labeled 1 to 5.
D.Reduce the production of mixed plastic.
高三英语阅读理解中等难度题查看答案及解析
Five steps to make a difference to the oceans
The oceans are being seriously polluted now. Plastics are harming the marine (海产的) life. Carbon pollution is warming the oceans and increasing their acidity(酸度). Waters are being overfished. 1. Here are some steps we can take to help make a difference.
1. Bring our own bags. 2. Try carrying a reusable bag at all times, including while traveling, and bringing our own things to work to avoid relying on plastic items.
2. Talk about it now. We should carry that conversation into public places. Talk to our friends and family about why the ocean is important and why we take steps to help it, and challenge them to do the same.
3. 3. A good way to make a difference is to organize a garbage cleanup now. Whether it’s an inland cleanup or one near the coast, plan one in our community.
4. Throw away our cars. 4. When we hang out, we should reduce our carbon footprint, which may help slow global warming and ocean acidification as well as conserve energy
5. Recycle, obviously. Experts say recycling is an obvious action to take. Check on what can be recycled in our community, and make sure you’re separating out your plastic.
In summary, think about it more and act on it more. The more someone thinks about plastics and plastics pollution, the environment and the consequences of our actions, the more likely they are to act on it. 5.
A. Plan a cleanup.
B. Choose public transportation over driving our cars.
C. Driving cars is not a good way to protect the oceans.
D. However, experts say there’s still hope to make a difference.
E. However, marine life plays a very important role in the oceans.
F. If everyone can contribute to the oceans, the oceans will be well preserved.
G. Whenever we put something, we should bring our own bag, but not a plastic one.
高三英语七选五简单题查看答案及解析
The story of a voyage bearing witness to plastic pollution in the oceans,Junk Raft(筏子），based on facts,is an exciting,thought-provoking book.Science educator and researcher Marcus Eriksen's navigational feat(航海壮举）is holding readers' attention and interest--88 days crossing some 4,000 kilometers of open ocean,on a raft made of 15,000 plastic bottles wrapped in fishing nets.But it is more. Two equally fascinating storylines are made up through the written records of a series of events: Eriksen's evolution from soldier to research director of the environmental non-profit 5 Gyres Institute, and the journey we all need to take towards a more sustainable use of plastics.
Around 15%of all the litter in our oceans in plastic,and a calculated 5 million tonnes of plastic waste enter the seas annually.Unavoidably,it is now present at the sea surface and on shorelines,in Arctic seas and on the sea bed at depths of 3,500 metres.Around 700 sea species are known to come into contact with pieces of waste plastic material-and can be harmed or killed by taking in it or becoming twisted and caught in it.There are also concerns about plastics accumulating in commercially important species of fish and shellfish.The waters and shores of Hawaii are particularly heavily pottuted, giving a rationale(理由）for Eriksen's destination.
This environmental challenge has attracted increasing scientific,media and societal attention in recent years. yet few accounts have conveyed the\wider picture accessibly Junk Raft does just this---while exposing our frustratingly slow progress on a issue of major importance to fisheries, tourism and,finally,the health of the world's oceans.
Eriksen lists the issues associated with the accumulation of sea plastic:the causes,consequences and potential solutions.Our single-use culture is the main offender.For more than 60 years,society and industry have been producing more and more throwaway items particularly packaging.Some solutions lie in better acquisition of materials at the end of their lives,in a circular economy.
Eriksen takes the crisis into consideration together with a timeline of scientific discovery and advancement since the 1970s.Alongside this he gives a very personal,somewhat North American,view the troubles of industry and policy involvement the side plots and blind alleys,and the tactics(战术） of avoidance and disturbance he has so often experienced.There are parallels,he shows,with the troubles that faced those who fought to raise awareness around the health impacts of smoking.
Throughout,we are regularly brought back to the realities of life aboard the raft,with Eriksen's fellow sailor Joel Paschal.This is both fascinating and eventful,from their slow,occasionally very dangerous progress to the moments when it seems the raft will break up into pieces,littering the ocean with the waste material Eriksen is trying so hard to fight against.Eriksen's wider journey also takes him onto dry land,where he touches on the accumulation of land plastic.He learns about the consumption of plastic bags by camels-a serious issue in some desert countries.
It can be difficult to judge the direct impacts of projects such as Eriksen's,but he rightly notes the Importance of raising awareness of the risks of disposable plastic.Eriksen has also done much to emphasize the environmental consequences of polymer microbeads(聚合物微粒）in the US Great Lakes, providing key evidence that led to the introduction of a law.
Junk Raft is filled with adventure,romance,a sense of optimism and important truths that will be needed by the thousands of groups.It serves as a reflection of the choices and journeys that each of us makes and helps us understand how plastic in the oceans is closely connected with the future of human life.
1.What makes the book Junk Raft attractive to readers?
A.The appeal for global environmental protection.
B.Efforts made to put an end to the use of plastics.
C.Erisken's adventures on the plastic ocean on a raft.
D.Eriksen's soldierly service and environmental study.
2.What has raised people's concern according to the passage?
A.More rubbish being poured into the oceans.
B.Plastics accumulating in rare species of fish.
C.Many species in the oceans suffering fro shock.
D.The waters of the oceans being polluted by plastics.
3.What does the underlined word"this"in Paragraph3 refer to?
A.Making accounts accessible.
B.Listing the environmental issues.
C.Taking the pollution into account.
D.Facing the environmental challenge.
4.What is the main reason for sea plastic pollution?
A.The overuse of household items.
B.The wasteful throwaway culture.
C.The production of more materials.
D.The failure to find potential solutions.
5.The trouble industry and policy engagement face lies in that_____.
A.the current policy is yet to be further perfected
B.people turn a blind eye to the plastics industry
C.people lack correct awareness of the problem
D.the market need for plastics is enlarging on land
6.What is the author's attitude toward Eriksen's work?
A.Cautious. B.Ambiguous.
C.Doubtful. D.Appreciative.
高三英语阅读理解困难题查看答案及解析
C
The world’s first plastic magnet (磁性) to work at room temperature has passed the elementary test of magnetism. Its creators at the University of Durham in the UK have used it to pick iron filings (铁屑) from a laboratory bench.
In 2001, chemists from the University of Nebraska-Lincoln claimed to have created the world’s first plastic magnet, but it only worked below 10 Kelvin (开氏温度). Other researchers have made plastic magnets, but generally they only function at extremely low temperatures, or their magnetism at room temperature is too weak to be business use.
So the Durham team can claim to have made the first plastic magnet that could be used in everyday products. One of the most likely applications is in the magnetic coating of computer hard discs, which could lead to a new generation of high-capacity discs.
Jerry Torrance, a material scientist who is an adviser to some of the world’s largest electronics and engineering companies, including IBM, describes the work as “a great scientific breakthrough”. However, he says that practical applications are probably still a long way off.
At first the new polymer (聚合物) showed little sign of magnetism, and after three months the researchers had reached the point where they felt that trying to induce (诱发) magnetism in this polymer was a waste of time. “Just as we were about to give up and try a different way, we decided to check the samples for a last time,” says Sean Giblin.
It was a fortunate decision, because over the months the original polymer had developed magnetic characteristics. Further groups of polymer proved its magnetism and ruled out the possibility that the magnetism had been caused by pollution. In addition, X-ray diffraction data (衍射数据) showed an increase in the straight line of the polymer chains over three months, which probably accounts for the increase in magnetism.
Although the polymer’s magnetism is weak compared with metal magnets, the researchers are confident that they can improve it. And in addition to computer hard discs, the team thinks that plastic magnets could have important medical applications because organic magnetic materials are less likely to be rejected by the body.
64. The plastic magnets made by the chemists from University of Nebraska-Lincoln and other researchers couldn’t be used in everyday products because ________ .
A. they didn’t pass the elementary test of magnetism
B. they couldn’t pick up iron filings from a laboratory bench
C. they wouldn’t work at room temperature
D. they could only be used at high temperature
65. The increase in magnetism over the months is probably caused by ________ .
A. checking the samples B. a wise decision
C. pollution
D. the increase in the straight line of the polymer chains
66. The plastic magnets could be used ________ .
A. to compare with the metal magnets
B. to coat computer hard discs
C. to produce medicine
D. to lower the temperature
67. What would be the best title for the passage?
A. The Birth of Practical Plastic Magnet
B. The World’s First Plastic Magnet
C. A Fortunate Decision
D. The Applications of Plastic Magnets
高三英语阅读理解简单题查看答案及解析
The world consumes hundreds of billions of single-use plastic bags each year. They are difficult to recycle, wasteful and damage the nature. Environmental activists want to ban plastic bags or---as many communities have done ---charge a fee for them. But the plastic bag industry defends their use, saying people reuse plastic bags, and industry officials argue recycling is a matter of personal responsibility and should not be forced.
City officials say New Yorkers use 5.2 billion plastic bags each year. They are offered free with nearly every supermarket, or convenience store purchase. Many people like them, even if they sometimes feel guilty about using them. But what happens to those bags after they’ve been used in a huge environmental problem. They are found on beaches. They are caught in trees. They are swallowed by marine life.
Plastic bags are made of petroleum products and natural gas, and do not biodegrade (分解). And they are difficult to recycle. So New York City spends nearly $ 10 million dollars a year to send 100---thousand tons of plastic bags to landfills out of state.
In Washington, D.C., a five percent charge on all single-use bags led to about a 60 percent reduction and in Los Angeles County in California , a 10 cent charge on single-use bags led to a 95 percent reduction. With a 10 cent charge on bags, customers are much more likely to stop and think about whether they need a bag or not. And that’s really all that these laws are doing.
1.Who object to the limit of using plastic bags?
A. Plastic bag makers. B. Government officials.
C. Stores and supermarkets. D. Most of the consumers.
2.Paragraph 2 mainly tells us _____.
A. the difficulty about dealing with plastic bags
B. the popularity of plastic bags in New York
C. the great convenience brought by using plastic bags
D. the usage and problems of plastic bags in New York
3.What measure does the writer introduce to reduce the use of plastic bags?
A. Reducing the production of plastic bags.
B. Charging for the use of plastic bags.
C. Offering paper bags instead of plastic bags.
D. Making people realize the harm of plastic bags.
高三英语阅读理解中等难度题查看答案及解析
Have you ever wondered how the trainers at Sea World get the 19,000-pound whale to jump 22 feet out of water and perform tricks? They get that whale to go over a rope farther out of the water than most of us can imagine. 1..
So how do the trainers at Sea World do it? The first thing they do is reinforce(强化) the behavior that they want repeated --- in this case, to get the whale to go over the rope.2., in a position where the whale can’t help but do what’s expected of it. Every time the whale goes over the rope, it’s given positive reinforcement and gets fed with fish. But what happened when the whale goes under the rope? Nothing — no criticism, no warning and no feedback. 3..
Positive reinforcement is the key of that simple principle that produces such splendid results. And as the whale begins to go over the rope more often than under, the trainers begin to raise the rope. It must be raised slowly enough so that the whale doesn’t starve.
4.. Make a big deal out of the good and little stuff that we want consistently. Secondly, under-criticize. People know they need help when they mess up. 5., people will not forget the event and usually will not repeat it.
So we need to set up the circumstances so that people can’t fail. Over-celebrate, under-criticize…and know how far to raise the rope.
A. This is a great challenge
B. And the whale stays right where it is
C. If we figure out a way to motivate the whale
D. They start with the rope below the surface of the water
E. If we under-criticize, punish and discipline less than expected
F. Whales are taught that their negative behavior won’t be acknowledged
G. The simple lesson to be learned from the whale trainers is to over-celebrate
高三英语七选五困难题查看答案及解析
Have you ever wondered how the trainers at Sea World get the 19,000-pound whale to jump 22 feet out of water and perform tricks? They get that whale to go over a rope farther out of the water than most of us can imagine. 1..
So how do the trainers at Sea World do it? The first thing they do is reinforce(强化) the behavior that they want repeated --- in this case, to get the whale to go over the rope.2., in a position where the whale can’t help but do what’s expected of it. Every time the whale goes over the rope, it’s given positive reinforcement and gets fed with fish. But what happened when the whale goes under the rope? Nothing — no criticism, no warning and no feedback. 3..
Positive reinforcement is the key of that simple principle that produces such splendid results. And as the whale begins to go over the rope more often than under, the trainers begin to raise the rope. It must be raised slowly enough so that the whale doesn’t starve.
4.. Make a big deal out of the good and little stuff that we want consistently. Secondly, under-criticize. People know they need help when they mess up. 5., people will not forget the event and usually will not repeat it.
So we need to set up the circumstances so that people can’t fail. Over-celebrate, under-criticize…and know how far to raise the rope.
A. This is a great challenge
B. And the whale stays right where it is
C. If we figure out a way to motivate the whale
D. They start with the rope below the surface of the water
E. If we under-criticize, punish and discipline less than expected
F. Whales are taught that their negative behavior won’t be acknowledged
G. The simple lesson to be learned from the whale trainers is to over-celebrate
高三英语七选五困难题查看答案及解析
According to the World Health Organization, air pollution is ____ millions of deaths every year.
A. original from B. suitable for
C. accessible to D. responsible for
高三英语单项填空中等难度题查看答案及解析
The sight of a mosquito can mean trouble to people in many parts of the world. The bite of the mosquito can be deadly. The insects carry serious diseases like malaria (疟疾). It is estimated that almost 630,000 people died from malaria and malariarelated causes in 2012, and most of these cases were in African countries.
In the United States, a group of California scientists are working to develop a more effective and less costly substance (物质) to protect people from mosquitoes. The researchers are investigating the sense of smell in mosquitoes. They found the insects use the same receptor for identifying carbon dioxide in human breath as they do for the smell of our skin. Anandasankar Ray, who is leading the investigation, says scientists tested more than a million chemical compounds (化合物) until they found a substance called Ethyl Pyruvate. He says Ethyl Pyruvate makes the mosquitoes' receptors inactive. “When we apply Ethyl Pyruvate to a human arm and offer it to hungry mosquitoes in a cage, very few of the mosquitoes are attracted to the human arm because only a few of them are able to smell it out,” said Ray.
Genevieve Tauxe, a member of the research team, says it was not easy to find the neurons (神经元) of noble cells that recognize both the smell of human breath and skin. “With the device used to examine the mosquito, we are able to insert a very small electrode (电极) into the part of the mosquito's nose, where its smelling neurons are and where the smell is happening,” said Tauxe.
Anandasankar Ray says a product based on Ethyl Pyruvate may cost less to produce than DEFT, the most effective chemical treatment now in use. He says DEFT is too costly for most people who live in areas affected by malaria.
“Perhaps by finding smells that can attack other target receptors, we will be able to improve upon DEFT and finally have the next generation of insect behaviour control products,” said Ray.ytytzygx.
1.The underlined word in the second paragraph probably means ________.
A. a substance that protects people from mosquitoes
B. a sense organ that reacts to changes
C. a device that reacts to light
D. a piece of equipment that sends signals
2.According to the passage, Ethyl Pyruvate can ________.
A. kill the mosquitoes' smelling neurons
B. cause the mosquitoes to lose their senses of smell
C. result in the inactiveness of the mosquitoes' receptors
D. make the mosquitoes uninterested in human breath and skin smell
3.This passage most probably appears in ________.
A. a textbook of medical schools
B. a collection of doctors' essays
C. the column of newspaper ads
D. the health column of a magazine
4.Which of the following would be the best title for the passage?
A. Ethyl Pyruvate—an Insect Behaviour Control Product
B. Malaria—a Serious Disease Causing 630,000 Deaths
C. Scientists Find a New Substance to Fight Mosquitoes
D. A New Generation of DEET Has Been Developed to Kill Mosquitoes
高三英语阅读理解中等难度题查看答案及解析