China has been planting seaweed for about 1,700 years . Coastal populations harvested a variety of algae first as a source of food and animal feed, but later for industrial and nutritional purposes as the practice became more widespread- Today, China remains the world’s biggest producer of farmed seaweed, but many other countries start to realize the potential of planting seaweed.
Certain red seaweed varieties contain up to 25% protein, but others are also rich in iron and other minerals. Seaweed planting becomes hot aquaculture which is now shooting up. In Alaska, where the largest seaweed farm in North America is located, farmers produced over 112,000 pounds of seaweed in 2019 — a 200% increase from Alaska’s first commercial harvest in 2017. Occupying just a few acres, seaweed planting is economical, relatively simple and comes with a lot of environmental benefits.
Research shows that seaweed could play a key role beyond serving as a source of nutrients and food, but also in the fight against some of the worst problems: climate change and ocean pollution. Seaweed doesn’t need to be fed or fertilized, as the crop gets everything it needs from sunlight and the natural nutrients already found in the ocean water. There are, of course, some disadvantages to seaweed farming. For example, overproducing seaweed could influence the amount of natural light available to other ocean species. In addition, technology for transporting, drying, and turning seaweed into biofuel and food can take up resources and give off CO2. It’s also possible that these crops could remove too many nutrients from the wild ecosystem.
However, as research continues to search into sustainable seaweed farming methods, we may discover that advantages win over disadvantages.
The economic value of dealing with nutrient pollution, for example, may reduce costs for wastewater treatment; the same goes for turning seaweed into biofuel, fertilizer, or fuel depending on water quality. The balance will come down to a combination of policy and scientific research .
1. Why does the author mention seaweed farming in Alaska?A.To show seaweed planting is growing fast. |
B.To announce seaweed planting is eco-friendly. |
C.To state seaweed is easy to plant across the world. |
D.To prove seaweed planting has large economic benefits . |
A.Removing other ocean species. | B.Consuming too many nutrients. |
C.Taking up too much space. | D.Causing potential ocean pollution. |
A.By making a comparison. | B.By providing evidence. |
C.By using classifications. | D.By analyzing the background. |
A.There are arguments over it. | B.Turning seaweed into fuel is necessary. |
C.It needs joint efforts to improve. | D.Dealing with nutrient pollution costs a lot. |
相似题推荐
【推荐1】A study from the University of California, Davis is the first to document personality in golden-mantled ground squirrels, which are common across the western US and parts of Canada, The study found the squirrels show personality for four main aspects: boldness(大胆), aggressiveness, activity level, and sociability. The findings suggest that understanding how an animal’s personality influences the use of space is important for wildlife conservation.
The fact that ground squirrels have personalities may not seem surprising. But the scientific field of animal personality is relatively young, as is the recognition that there are ecological consequences of animal personalities. For instance, bolder, more aggressive squirrels may find more food or defend a larger area, but their risky behavior may also make them easily hurt by predators(捕食者)or accidents. Lead author Jaclyn Aliperti conducted the study while earning her PhD in ecology at UC Davis.
Scientists have been studying golden-mantled ground squirrels at the Rocky Mountain Biological Laboratory in Gothic, Colorado for decades. It was established as a long-term study site more than 30 years ago by Aliperti’s advisor, Dirk Van Vuren. Aliperti drew from this powerful data set for her study, while also starting a series of experiments there over the course of three summers to observe and quantify the squirrels’ personalities. Overall, the study, published in the journal Animal Behaviour, found that bolder squirrels had larger core areas where they concentrated their activities. Bold, active squirrels moved faster. Also, squirrels that were bolder, more aggressive and more active had greater access to habitats, such as rocks. The location of the habitat is important because it can provide a belter point for observing and evading predators. Interestingly, habitat is also associated with sociability.
“Animal personality is a hard science, but if it makes you relate to animals more, maybe people will be more interested in conserving them,” said Alipcrti.
1. What’s the significance of the findings in paragraph 1?A.To better protect wildlife. |
B.To know more about space. |
C.To observe squirrels’ behavior. |
D.To explore squirrels’ personalities. |
A.Hunt for more food. | B.Work against each other. |
C.Show their personalities. | D.Attract less predators. |
A.Keeping. | B.Refusing. |
C.Killing. | D.Avoiding. |
A.Skeptical. | B.Supportive. |
C.Worried. | D.Tolerant. |
【推荐2】What’s the first thing that pops into your mind when you think of wheat straw? Most people would probably just see it as a pile of waste in a farmer’s field. However, Wu Cui, an intangible cultural inheritor, can turn the straw left over from harvested wheat into beautiful and eye-catching functional artworks.
The earliest straw-weaving(草编的)products were discovered at Hemudu Cultural Ruins, a Neolithic cultural site located in eastern China’s Zhejiang province. The Book of Rites, one of the classical works of Confucianism, also records that there were already mats made of cattail grass and professional straw-weaving craftsmen during the Zhou Dynasty(c.11th century-256 BC).
Straw weaving is a method of making daily items or artworks. It was listed as a national intangible cultural heritage in 2008.
Wu explains the process of straw weaving: selection of materials is the first step of a complicated, time consuming and labor-intensive process that can take weeks, or even months, to complete. You need to sketch(索描)the piece on paper, which requires drawing skills. Next comes weaving, shaping and preserving of the work. Even by finishing that process, it does not mean that you will always create a good piece of work, and the hardest part is to make it lifelike.
In the past, woven straw items could be found almost in every household in the countryside, such as straw hats and straw shoes, because they were practical in everyday life. But due to the impact of industrialization, manufactured goods have replaced such products, which cause low profits, and there are only about 100 individuals engaging in the work across the country. “The world has changed, and craftsmen need to transcend(超越)practicality and pursue the beauty and artistry of straw culture to help the craft survive and thrive(茁壮成长),” Wu says.
From her perspective, straw weaving should respond to people’s needs and preferences, while still drawing inspiration from traditional culture, “Craftspeople should make a great effort to grasp the trends and opportunities of the times to create new and relevant products,” she says. When asked about her plans, Wu says she wants to dig deeper into local traditional culture and create cultural creative products by developing the straw-weaving technique.
1. What does paragraph 2 mainly tell us about straw-weaving products?A.Their historic origins. | B.Their cultural value. |
C.Their major uses. | D.Their producing process. |
A.Selecting suitable materials. | B.Drawing sketches on paper. |
C.Making the artworks vivid. | D.Preserving finished products. |
A.Craftsmen should bring forth new ideas in the crafts based on traditional culture |
B.Pursuing fashion should be the first preference for eraftspeople. |
C.Local people benefit a lot from the straw—weaving techniques. |
D.Straw-weaving products are out of favor with customers. |
A.To explain the process of straw weaving. | B.To present the future of a traditional culture. |
C.To introduce a way to pursue the beauty and artistry. | D.To propose a new means of crafting. |
【推荐3】Big Stuff
Do you know what is the tallest building in the world and where the tallest Ferris wheel is? Have you heard of the world’s steepest roller coaster? Have you seen the biggest monster truck? Here are some of the most huge things on Earth.
A Towering Achievement
Burj Khalifa, a tower in Dubai, United Arab Emirates, is the world’s tallest structure. The 162-story building, which opened in 2010, stands over 2,717 feet tall. Seen from above, the tower has a Y-shaped design. Its three tall, narrow wings are joined in the middle. Like the legs of a tripod (三脚架), each wing is supported by the other two.
A Wheel Winner
About 15 miles from the world’s tallest building stands the world’s tallest Ferris wheel, Ain Dubai. Also called an observation wheel, Ain Dubai stands 820 feet tall. Each of the 48 cabins can carry 40 people for spectacular views of Dubai, United Arab Emirates. Before construction, support columns had to be driven 115 feet down through the earth to reach bedrock.
Extreme Ups and Downs
The world’s tallest roller coaster is Kingda Ka at Six Flags Great Adventure. At 456 feet, the peak of the ride towers over nearby Jackson, New Jersey. A 500-foot-tall crane was needed to place the final section at the top. Like many weight-bearing structures, the tower makes use of the most stable geometric (几何的) shape, the triangle.
A Monster of a Truck
Designed and built by business owner Bob Chandler, Bigfoot 5 has held the record for the world’s biggest monster truck since 1986. Other trucks, including Bigfoot models, have been designed to perform better in competitions. But Bigfoot 5 still stands above the crowd, thanks to its 10-foot-tall tires. The tires were originally designed for equipment that drives on Alaska’s snowy tundra.
1. What do Burj Khalifa and Ain Dubai have in common?A.They have similar structures. |
B.They are located in the same city. |
C.They are designed by the same architect. |
D.They are intended for visitors to overlook the views. |
A.Ain Dubai has a Y-shaped design. | B.Other trucks perform better than Bigfoot 5. |
C.Kingda Ka takes advantage of the triangle. | D.Burj Khalifa can carry 40 people for spectacular views. |
A.Business. | B.Lifestyle. | C.Entertainment. | D.Advertisement. |
【推荐1】On Wednesday a powerful earthquake hit Amatrice that was at the epicenter(震中), which is the point in the earth’s surface directly above where the earthquake happens. The town’s clock tower was the only building still standing. Italy’s prime minister said the earthquake had killed at least 120 people, and warned that the number might increase. There were several villages that were affected in farther mountainous areas. The earthquake was also felt as far away as Rome, 100 miles from the epicenter.
Earthquakes can’t be predicted. There are warning systems that can save some lives, but only under certain conditions. Unlike a tomnado warning where radar can see it and issue a warning before it, an earthquake warning happens when the earth is already shaking. We don’t have a system that can predict when the earth is going to shake. Our warning system is based on the fact that the earth is already shaking. The warning depends on how far you are from the earthquake epicenter. If you’re at an earthquake epicenter, you’re going to get no warning. If you’re far away from the epicenter, we can give you some time to prepare.
Another condition is how close the sensor is to the epicenter. If the sensor is 10 miles away from the epicenter, it takes five seconds to get to that sensor. So, the more sensors we get, the more time we’ll get as well. If you get 10 seconds notice of an earthquake that’s happening, especially a big one, you can open up the lifts on the nearest floor. You can also stop all the things that are moving before the shaking gets there. If you’re 30 miles away, your warning could be 15 seconds. It is 15 seconds that can save your life.
1. What can be learned from the first paragraph?A.The earthquake happened on Monday. |
B.The earthquake destroyed all the buildings. |
C.Fewer than 120 people lost their lives. |
D.Rome is about 100 miles away from Amatrice. |
A.It can always give us time to prepare. |
B.It is different from the tornado warning. |
C.It can tell us how to prepare for the earthquake. |
D.It can predict when earthquakes will happen. |
A.5 miles. | B.10 miles. | C.20 miles. | D.30 miles. |
A.A Powerful Earthquake | B.The Introduction of the Earthquake Warning |
C.Earthquakes and Tornados | D.How the Earthquake Happens |
【推荐2】Earth's longest artificial structure is usually said to be the Great Wall of China while the second-longest is not a wall, but a fence. It stretches for 5,614km across eastern Australia and is intended to stop the country's wild dogs, the dingoes, from hunting sheep.
Australia's dingo fence does not stand alone. Millions of kilometres of fences wrap the world. Some are intended to limit the movement of animals, some the movement of people, and some merely to mark the the boundary.
Until recently, data on the effects of fences on wildlife have been inadequate. That has changed with the publication of a report by professor Alex McInturff. One discovery he has made is that more than half of published fence research focuses on just five countries-America, Australia, Botswana, China and South Africa. A second is that only a third of these studies examined the impact of fences on anything other than the target species involved, meaning the animals purposely intended to be kept in or out.
Non-target species, however, are often those that have their fortunes most greatly reshaped by the appearance of poles and wire. Australian fences intended to keep out dingoes are also barriers to long-necked turtles, which travel great distances over land when moving between nesting sites. In Botswana fences built to spare cattle from wildlife-borne disease result in serious interference with wildebeest (角马) migrations.
Not every creature fares badly. Hawks (鹰) in Montana gladly sit on newly built livestock fences to hunt small animals, while fence-based spiders in South Africa outperform their tree-based cousins when it comes to catching insects.
Often, though, the winners are creatures that cause trouble for existing ecosystems. Keeping dingoes out of large parts of Australia has allowed aggressive red foxes to multiply. Native rodents (啮齿类动物) have suffered as a result. Some have been brought to the edge of extinction.
1. Which is a purpose of building fences?A.To expand the boundary of a country. |
B.To protect livestock like sheep and cattle. |
C.To stop wild animals from being hunted. |
D.To help people move around freely. |
A.Data on the impact of fences have been proved. |
B.Previous researches were complete and systematic. |
C.About two-thirds of the studies focus on the target animals. |
D.Not all studies examined the effect of fences on wildlife. |
A.Cattle in Botswana. |
B.Wildebeest in Botswana. |
C.Red foxes in Australia. |
D.Native rodents in Australia. |
【推荐3】China is showing the world its great resolve in the global climate campaign with concrete and selfmotivated efforts as well as serious commitment.
At the opening ceremony of the Paris climate summit, Chinese President Xi Jinping restated China’s plan made in June to cut its carbon emissions( 排放)per unit of GDP by 6065 percent from 2005 levels by 2030, and increase nonfossil fuel sources in primary energy consumption to about 20 percent.
With a large population, China is facing increasing resource limits, severe environmental pollution and a worsening ecosystem, and its citizens are also becoming increasingly aware of environmental problems. Suffering environmental problems and seeing the efforts as important to transforming its economic growth pattern, the country has much at risk if climate change is left unattended.
Actually, climate change efforts are already included in China’s mediumand longterm program of economic and social development, and ecological efforts are the clear characteristics in China’s 13th FiveYear Plan(20162020).
Although it is and will be a developing country for a long time to come, China has been actively involved in the global campaign against climate change, now topping the world in terms of energy conservation and use of new and renewable energies.
However, China’s development rights need to be respected. It is unfair to overstress China’s status as one of the world’s largest greenhouse gas emitters and regard it as the major part of responsibilities in the global fight against climate change.
It is worthy of notice that China’s emissions of greenhouse gases per person are far lower than those of developed countries, especially the United States, although rapid economic expansion and its population base have made it one of the biggest producers of the gases.
To show its great resolve, Beijing in September also announced the establishment of an independent SouthSouth cooperation fund of ¥20 billion to help developing countries affected by global warming.
While China is eagerly accomplishing its policy commitments, developed countries should stop questioning China’s commitment to fighting climate change and pointing fingers, and start shouldering their due responsibilities instead.
1. China is selfmotivated to transform its economic pattern in order to ________.A.top the world |
B.fight against climate change |
C.solve its population problem |
D.respond to pressure from developed countries |
A.China |
B.the United States |
C.economic expansion |
D.the population base |
A.China will completely use nonfossil fuels by 2030 |
B.China will carry out its plan by stopping its development |
C.Chinese emit more greenhouse gases than Americans on average |
D.some developed countries are not taking on their due responsibilities |