1 . He may be approaching his 90th birthday, but Sir David Attenborough has no desire to slow down. Fresh from an appearance at the Paris climate change summit, he fronts a new series David Attenborough’s Great Barrier Reef (大堡礁).
“There was a book by Saville-Kent called The Great Barrier Reef with fascinating hand-drawn illustrations which always fascinated me as a child. It was as if born from pure imagination. I thought no such place on earth can surely exist.” he said.
Nearly sixty years after his first visit, Attenborough dives 1000 feet below the surface off the Queensland coast to explore the world’s largest living organism like never before.
“It was the first place I was lucky enough to scuba (水肺) dive and I was, entering those waters, welcomed by magic. It was 1957 and I was shocked by remarkable beauty and life.”
The dive also gives Attenborough the chance to properly examine the effects of climate change and how the rising temperatures and acidity of the seas is causing harm to the reef.
“You can see where the sea grass is going and you know that if it continues on like that for the next decade or so, the coral (珊瑚) won’t be able to tolerate it. You can show experimentally that they’re incapable of living in these higher temperatures and the acidity will be such that they won’t be able to form coral limestone (灰岩) anymore,” he explains.
Attenborough admits that though he is incredibly enthusiastic about spreading awareness of climate change he was unwilling to be referred to as an authority on the subject. “I have a view, but it’s a second-hand view. I haven’t done the chemistry,” he said.
The truth is, he is well respected and beloved. When he talks about something as serious as climate change we are willing to pay attention.
1. What impressed Attenborough in his childhood?| A．The vivid imagination of TV series. | B．Severe pollution on the Great Barrier Reef. |
| C．The importance of climate change summits. | D．Interesting pictures in The Great Barrier Reef. |
| A．Mild temperatures stopped the growth of coral. |
| B．The sea grass posted a potential threat to the coral. |
| C．The acidity sped up the formation of coral limestone. |
| D．Scientists were doing experiments under deep sea water. |
| A．Passionate and frank. | B．Humourous and creative. |
| C．Brilliant and sociable. | D．Competent and generous. |
| A．To set an example for the old. | B．To analyze climate change effects. |
| C．To introduce a famous and admired person. | D．To promote underwater sports. |
2 . Soda bottles and sour cream containers—these plastics (and many others) typically arrive at recycling plants mixed together in the same bin. But because they are made of different molecular (分子的) building blocks, called monomers, they must be sorted into different streams before they can be melted to make new products. Otherwise, their various monomers tend to separate from one another like oil and water.
“Until about a year ago, everybody thought the only thing you could do is take a plastic, break it down to a monomer and then reform it,” says Sanat Kumar, a chemical engineer at Columbia University. “Now we’ve come up with a different way of doing it.” His team has developed a process that allows different kinds of plastic to be recycled together. Their findings, reported recently in Nature, could give new life to many items that end up in landfills.
The new process solves the problem by adding chemicals called universal dynamic cross-linkers to the mix. Just as soap brings together oil and water, these cross-linkers form covalent (共价的) molecular bonds that tie the diverse monomers together. This process creates materials that can keep certain useful properties of each plastic, such as keeping oxygen from passing through. These materials can then be melted and remade again and again because the cross-linkers can break and re-form their bonds.
The researchers hope the technique could eventually help repurpose more plastic waste, and Kumar says the process consumes less energy than breaking plastics down into their original monomers—but it’s not yet cheap enough to be widely used at existing recycling facilities. Still, showing that it works could lead to profitable markets for less expensive recycled plastics, which Kumar says would be one way to help recyclers eventually address the plastic waste crisis. “The plastics problem is huge,” he says, “and you’re going to have to look for multiple solutions.”
1. What’s the first paragraph mainly about?| A．The recycling method of plastics. |
| B．The present situation of plastic pollution. |
| C．The difficulty of recycling mixed plastics. |
| D．The variety in monomers among different plastics. |
| A．Sorting out plastics. | B．Recycling plastics. |
| C．Breaking down plastics. | D．Melting plastics. |
| A．They can be used as soap to bond oil and water. |
| B．They can keep oxygen from passing through. |
| C．They can maintain their own useful properties. |
| D．They can help bring different monomers together. |
| A．Its relatively high cost. | B．Its low efficiency. |
| C．Its negative environmental effect. | D．Its high energy consumption. |
3 . The world’s forests may hold more secrets than previously thought: a new global estimate of tree biodiversity suggests that there are about 9,200 tree species remaining undocumented. Most are likely in the tropics, according to the new research.
The new research drew on the efforts of hundreds of contributors, who have categorized trees in two huge data sets: One, the Global Forest Biodiversity Initiative, records every species found in extensively documented forest plots worldwide. The other, TREECHANGE, puts together sightings of individual species. Together they suggest there are approximately 64,100 recorded tree species on the planet — up from previous estimates of around 60,000.
The researchers reached their estimate of an additional 9,200 yet undocumented species on the basis of the number of rare ones already in the databases. Most unknown species are likely to be defined as rare, found in limited numbers in small geographical areas, says the quantitative forest ecologist Jingjing Liang. The team’s result is “a rather conservative estimate,” Liang says, “because scientists know less about the preponderance of uncommon trees in places such as the Amazon, where out-of-the-way spots could host pockets of unusual species found nowhere else.” “If we can focus the resources on those rain forests in the Amazon,” Liang adds, “then we would be able to estimate it with higher confidence.”
Silman, a conservation biologist, who was not involved in the new study agrees that the study result is likely an underestimate. His and his colleagues’ local surveys suggest there are at least 3,000 and possibly more than 6,000 unknown tree species in the Amazon basin alone. Tree species often get grouped together based on appearance, he notes, so new genetic analysis techniques will likely lead to the discovery of even more biodiversity. Sliman wonders how many species will go extinct before scientists describe them. “How many are already known to native peoples in the Amazon — or were known to peoples or cultures who have themselves been made extinct through colonization, disease, or absorption? How many “species” already have dried samples sitting in a cabinet?” he says.
Searching for the new species will inform not only conservation but the basic evolutionary science of how and why species diversify and die out, Silman says. “Just the fact that there are thousands of species of something as common as trees out there that are still left to be discovered,” he adds, “I find pretty inspirational.”
1. What is the finding of the new research?| A．About nine thousand new tree species have been identified. |
| B．Thousands of tree species remain unknown to science. |
| C．Maintaining tree diversity has become a global challenge. |
| D．Human activities have led to the reduced number of trees. |
| A．The researchers adopted quality method to analyze data. |
| B．The researchers did extensive field study in out-of-the-way spots. |
| C．Inferring from the existing dada is the main research method. |
| D．Doing surveys and interviews is the main research method. |
| A．majority | B．evolution | C．cultivation | D．capability |
| A．genetic analysis technique failed to produce accurate information |
| B．trees of similar sizes in the Amazon basin are grouped together |
| C．too many rare trees were made into dried samples before being documented |
| D．the local peoples or the local cultures are not fully aware of the tree species. |
1. What is the aim of the campaign?
| A．To remind people of Earth Day. |
| B．To encourage people to reduce garbage. |
| C．To warn people of the bad effects of pollution. |
| A．Designing posters. | B．Planting trees. | C．Collecting garbage. |
| A．Stop driving cars. | B．Paint paper. | C．Decorate classrooms. |
| A．Wonderful. | B．Confusing. | C．Strange. |
5 . Poaching (偷猎) is a major cause of decline for elephants, with a total decrease to about 415,000, according to the International Union for Conservation of Nature.
The research team found that poaching occurred more frequently in Central Africa and near the Mozambique-Tanzania border. In recent years, Garamba National Park, in the Democratic Republic of Congo, saw more than 860 elephants die at the hands of poachers, and Selous Game Reserve, in Tanzania, more than 750. Researchers discovered that the household wealth of those surrounding areas was relatively low and they hold a mid-level health.
Researchers said, “Illegal killings are driven by criminal networks who recruit poachers rather than by opportunistic hunters. When a lot of Africa’s national parks were established, people were often forced to be evicted from the land that was now designated a protected area. Local people who had been lived on hunting suddenly became described as poachers.”
“People living within about five miles of wildlife protected area in Tanzania also reported losing up to half their income. A local survey showed the destruction of their crops by elephants and killings of their livestock by lions.” Someone added, “If you’re closest to the park, you really do suffer more cost than benefit of the protected area.”
Researchers also noted, “When local communities enjoy the benefits of conservation, it will reduce incentives (诱因) to poach. When governments ensure that local communities are not subject to carrying the burden of the costs associated with this wildlife, they will have more access to income-generating opportunities that can help to lift communities out of poverty.”
Conservationists have to think creatively, carrying out strategies such as reducing demand in ivory-consuming countries, improving educational standards and medical facilities, and increasing support for wildlife rangers. “When we are looking to protect wildlife, we can’t do that without thinking about the well-being of people,” researchers said.
1. What do the numbers in Paragraph 2 imply?| A．Elephants mainly appear in Africa. |
| B．Poachers have found the track of elephants. |
| C．Elephants living in the protected area are facing a decline. |
| D．Hundreds of elephants in Africa die at the hands of poachers. |
| A．Leave. | B．Return. | C．Wander. | D．Seek. |
| A．Elephants poaching is likely driven by need, not greed. |
| B．Household wealth of people in the protected area is relatively high. |
| C．Wildlife protection and people’s well-being should go hand in hand. |
| D．People living close to the wildlife reserve lose nearly half their income. |
| A．A health column. | B．A travel brochure. |
| C．A geographic magazine. | D．A news story. |
1. What is Dr. Tilly expert in?
| A．Renewable energy. |
| B．Educational courses. |
| C．Sea life conservation. |
| A．They weren’t efficient. |
| B．They harmed some sea life. |
| C．They didn’t have enough power. |
| A．A journey to the sea. |
| B．A chance to create devices. |
| C．An opportunity to work at a lab. |
1. When did the speaker know about the construction of a park for the locals?
| A．Last month. | B．Last week. | C．Yesterday. |
| A．They chat there. | B．They throw the garbage there. | C．They raise animals there. |
| A．On the streets. | B．At their own homes. | C．In the park. |
| A．Unfavorable. | B．Casual. | C．Favorable. |
8 . Most glitter(小发光物品), which is made up of tiny pieces of plastic, is a huge danger to the environment. “Everyone talks about the mountain of plastic floating in the ocean. You can grab empty bottles from the water, but with tiny pieces, it’s impossible,” says Victor Alvarez, a chemical engineer who sells an eco-friendly alternative to glitter.
In the early 2,000s, Alvarez worked for Mercedes-Benz in Germany, where he became fond of any technology that protected the environment. A few years after leaving Mercedes-Benz, he founded Blue Sun International in Miami, which makes specialty ingredients for the skin and hair care industries.
Glitter is a popular ingredient in cosmetics, such as eye shadows and lipsticks. So Alvarez began researching an alternative that didn’t contain plastic to make his products safer for the environment. That’s when he came across Ronald Britton Ltd., a company which had developed a plastic-free, biodegradable product called Bioglitter. It is made from regenerative cellulose(纤维素) sourced from hardwoods, primarily eucalyptus(桉树). Alvarez worked with the company to become the first retailer to sell Bioglitter in America. In 2018, he formed Today Glitter in order to sell the biodegradable glitter directly to consumers through its website.
Today Glitter sells two kinds of biodegradable glitter Bioglitter Sparkle and Bioglitter Pure. Both are almost plastic-free and can biodegrade in a short time. Meanwhile, they are as shiny as regular glitter. All these products are third-party tested by TÜV, an international organization that provides testing and certification for compostable (可降解的) and biodegradable products.
Despite its benefits, the hardwoods needed to make biodegradable glitter cause it to cost about twice as much as conventional glitter. A small glass container that contains just 6 grams of Bioglitter costs $10, while the same amount of regular glitter could cost at least half that amount. Alvarez expects the price will come down over time. He also expects the company’s sales to cross $1 million next year. But more importantly, Alvarez says, his main goal is to effect a meaningful change.
1. While at Mercedes Benz, Alvarez .| A．developed a way to grab glitter in the sea | B．became interested in the environment |
| C．attempted to live a plastic-free life | D．created a kind of harmless glitter |
| A．It is a plastic-free ingredient for eye shadows. |
| B．It will soon be on sale in the American market. |
| C．It is very difficult to break down in the wild. |
| D．It was invented by Blue Sun International. |
| A．To show Bioglitter Sparkle and Bioglitter Pure are popular. |
| B．To stress it provides a broad range of testing services. |
| C．To prove Today Glitter’s products are eco-friendly. |
| D．To explain many plastic products are low-quality. |
| A．The complex process of making glitter. | B．How to expand its overseas market. |
| C．How to attract potential investors. | D．The high cost of raw materials. |
This year, August 15th marked China’s first National Ecology Day,
The establishment of National Ecology Day will enhance ecological understanding among the public and help the nation
The move
China’s laws and administrative regulations
The extinction of the Chinese paddle-fish (白鲟) and wild Yangtze sturgeon (野生长江), announced by the international Union for Conservation of Nature (IUCN), started
The IUCN’s latest list of threatened species showed that 100% of the world’s remaining 26 sturgeon species are now
The Chinese paddle-fish was one of the biggest freshwater fish species in the world
