1 . A huge section of the Milne Ice Shelf, located on Ellesmere Island in the northern Canada, collapsed into the Arctic Ocean, according to the Canadian Ice Service. This created an “ice island” which is about 30 square miles in size. As a comparison, Manhattan Island is about 23 square miles.
“Entire cities are that size. These are big pieces of ice,” Luke Copland, a glaciologist at the University of Ottawa who was part of the research team studying the ice shelf, told Reuters. “This was the largest remaining intact (完整的) ice shelf, and it’s collapsed, basically. ”
The Canadian Ice Service said on Twitter that “above-normal air temperatures, offshore winds and open water in front of the ice shelf are all part of the recipe for the ice shelf to break up.” A huge section of the Milne Ice Shelf has collapsed into the Arctic Ocean, producing a 30-square-mile ice island.
The ice shelf has now been reduced in area by about 43%. An ice shelf is a thick slab of ice, attached to a coastline and extending out over the ocean, according to the National Snow and Ice Data Center. “Some shelves have existed for thousands of years,” the center said.
So what’s going on up there? Though the planet is warming worldwide due to climate change, the Arctic has been warming at a rate twice that of the rest of the world. This summer has been particularly warm: Arctic sea ice melted to its lowest July level on record and in June, a town in Siberia soared (急升) to 100.4 degrees Fahrenheit, believed to be a record high for the Arctic.
“When I first visited those ice caps, they seemed like such a permanent fixture of the landscape,” Mark Serreze, director of the NSIDC and geographer at the University of Colorado, Boulder, said in a statement. “To watch them die in less than 40 years just blows me away.”
1. Why does the author mention Manhattan Island in Paragraph 1?| A．To stress that Manhattan Island is vital for Canada. |
| B．To introduce where Manhattan Island locates. |
| C．To say the great collapse is terrible. |
| D．To compare two different places. |
| A．Its location. |
| B．Its huge body. |
| C．Special intact form. |
| D．Higher air temperatures. |
| A．Arctic sea ice melted to its lowest in June. |
| B．Climate change brings about great changes. |
| C．The earth is warming because of the loss of ice shelf. |
| D．The Arctic warms more slowly than the rest of the world. |
| A．Shocked. | B．Humorous. |
| C．Scientific. | D．Neutral. |
2 . Malin Pinsky had the first of two lightbulb moments in 2003 while crossing Drake Passage. He was then standing on the bridge of a research ship and was scanning the sky for seabirds, which was one of his duties as a research technician on the cruise (海上航游). Just five months earlier he had finished college, where he studied biology and environmental science.
As the ship entered nutrient-rich Antarctic waters, whales suddenly showed up all around the ship. That moment on the bridge helped him realize that the ocean looks featureless from the top, but there’s so much going on underneath.
The second lightbulb moment hit him several months later. Pinsky was then an intern (实习生) in Washington, D.C. His job was making photocopies. It was around the time when two big reports had come out. Both focused on what policies might best preserve U.S. ocean resources. “I realized we have all these laws and policies that determine how we as a society interact with the ocean. But they’re far out of date. We don’t yet have the science to know what the new policy should be,” Pinsky said.
Today he runs a lab with about 20 workers. His team wants to seek how our changing climate, as well as overfishing and habitat destruction, might be driving changes in fish and other animals in the sea. To find out, team members travel each year to coral reefs near the Philippines. There, they carefully catalog populations of different fish. They collect data on the growth and mating of these fish, their diversity and other factors.
“Pinsky’s broad approach to the problem — looking at species, where they live and how fisheries are managed — is setting the pace for other scientists,” says Kimberly Oremus, a fishery economist at the University of Delaware in Newark. “Pinsky is pushing the whole field to respond to his growing body of research.”
1. What made Pinsky have the first lightbulb moment?| A．The vastness of the ocean. |
| B．The sight of seabirds in the sky. |
| C．The view of Drake Passage. |
| D．The appearance of whales around the ship. |
| A．He needed to take more photos of oceans. |
| B．He should do something to update ocean policies. |
| C．The U.S. ocean resources need to be better preserved. |
| D．There have already been perfect policies to preserve the ocean. |
| A．The harm of overfishing. |
| B．Features of different fish. |
| C．Factors affecting ocean ecosystems. |
| D．The reasons for global warming. |
| A．Positive. | B．Doubtful. | C．Disapproving. | D．Uninterested. |
1. Why did the man go to the Philippines?
| A．For a trip. | B．For further studies. | C．For volunteer work. |
| A．The local students. |
| B．The local government. |
| C．The local businessmen. |
| A．To explore an island. |
| B．To help the poor students. |
| C．To protect the environment. |
4 . As awareness of climate change grows, so does the desire to do something about it. But the scale of the problems it causes—from wildfires to melting glaciers to droughts—can seem utterly overwhelming. It can be hard to make a connection between our everyday lives and the survival of polar bears, let alone how we as individuals can help turn the situation around.
One way to gain a quantifiable understanding of the impacts of our actions, for good and bad, is through what is known as a carbon footprint. But while the concept is gaining traction, it is not always fully understood. According to Mike Berners-Lee, a professor at Lancaster University in the UK and author of The Carbon Footprint of Everything, it is “the sum total of all the greenhouse gas emissions that had to take place in order for a product to be produced or for an activity to take place.”
What steps a person can take to reduce their personal footprint the most of course depends on the kind of lifestyle they presently live, and the same actions are not equally effective for everyone. Berners-Lee notes that, “for some people, flying may be 10 percent of their footprint, for some people it’s zero, and for some it’s such a huge number that it should be the only thing they should be thinking about.”
It isn’t easy to calculate a carbon footprint and it has been claimed that the earliest such calculator appeared in 2004 as part of the “Beyond Petroleum” campaign of oil giant BP—a fact that causes some observers to criticize the pressure to reduce personal carbon footprints as a “sham” to “promote the slant that climate change is not the fault of an oil giant, but that of individuals.”
“I would say personal carbon footprint calculators are a useful tool to assess the impact of your immediate actions.” Berners-Lee says. “But what’s much more important than your personal carbon footprint is your climate shadow, which aims to paint a picture of the full sum of one’s choices and the impact they have on the planet. For example, how you vote, where you work, how you invest your money, and how much you talk about climate change.
1. What does the underlined word “traction” in paragraph 2 probably mean?| A．attention | B．insight | C．control | D．power |
| A．By presenting a fact | B．By making a comparison |
| C．By clarifying a concept | D．By giving suggestions |
| A．unclear | B．favorable | C．indifferent | D．disapproving |
| A．Tools are more important than choices. | B．Only individuals are responsible for climate change. |
| C．Climate shadow covers a broad range of actions. | D．Calculating carbon footprint is the most effective. |
5 . Researchers in Australia have identified enzymes (酶) in the body of certain beetle larvae (甲虫幼虫) that can degrade or break down plastic. In a study published in Microbial Genomics, they write that these “superworms” could help reduce plastic waste in the future.
“Superworms are like mini recycling plants, cutting up the polysyrene (聚苯乙烯) with their mouths and then feeding it to the bacteria in their stomach,” said Chris Rinke from the University of Queensland in Australia. “The breakdown products from this reaction can then be used by other microbes to create high-value chemicals.”
In the study, scientists divided beetle larvae into three groups, feeding one group wheat bran, one polystyrene and one nothing. Over three weeks, they monitored their growth. “We found that superworms fed a diet of just polystyrene not only survived, but even had marginal weight gains,” said Rinke. “This suggests the worms can get energy from the polystyrene, most likely with the help of their stomach bacteria.”
On the other hand, the plastic-fed worms gained much less weight and were overall much less healthy than the bran-fed ones, though better off than the starvation group. After three weeks, some larvae were also set aside to grow into beetles, according to the study. About 93% of the bran-fed larvae formed adult worms, while about 67% of the plastic-fed larvae and 10% of the starved larvae formed adult worms.
The researchers investigated the superworm’s stomach bacteria to find the specific enzymes linked to plastic degradation, writes Fionna M. D. Samuels for Scientific American. The enzyme that degrades the polystyrene appears to live with the stomach bacteria, not the worm itself.
Polystyrene is one of the most common plastics used today. But it’s not very chemically reactive, and breaking it down with industrial recycling methods takes high heat. So, researchers have been looking for plastic-degrading enzymes and bacteria for years.
Further research will still need to be done to figure out how to employ these worms, bacteria and enzymes in recycling facilities.
1. What does Chris Rinke compare superworms to?| A．Small plants. | B．Beetle larvae. | C．Stomach bacteria. | D．High-value chemicals. |
| A．Few. | B．Tiny. | C．Obvious. | D．Normal. |
| A．The damage of plastic to life. |
| B．Possible causes of plastic pollution. |
| C．Researchers’ efforts over the years to recycle plastic. |
| D．The necessity of finding out a way to degrade plastic. |
| A．To report a new way to recycle plastic. | B．To call on people to reduce plastic waste. |
| C．To explain how larvae can degrade plastic. | D．To introduce the findings of a new research. |
| A．The environment. | B．An activity. | C．A lifestyle. |
| A．The price. | B．The food. | C．The environment. |
1. What is the main purpose of the weather warning system?
| A．To warn people outdoors to get inside. |
| B．To let people test the warning system. |
| C．To inform people without radios of danger. |
| A．Local media. | B．Local officials. | C．Local residents. |
| A．To the park. | B．To the public shelter. | C．To the inside of a building. |
| A．A warning system. | B．A weather report. | C．An accident. |
9 . For years, scientists have debated whether humans or the climate have caused the population of large mammals to decline dramatically over the past several thousand years. A new study from Aarhus University confirms that climate cannot be the explanation.
About 100,000 years ago, the first modern humans migrated out of Africa in large numbers. They were very good at adapting to new habitats, and they settled in almost every kind of landscape — from deserts to jungles to the icy taiga in the far north.
Part of the success was human’s ability to hunt large animals. With clever hunting techniques and specially built weapons, they perfected the art of killing even the most dangerous mammals.
But unfortunately, the great success of our ancestors came at the expense of the other large mammals.
It is well-known that numerous large species went extinct during the time of worldwide colonization by modern humans. Now, new research from Aarhus University reveals that those large mammals that survived also experienced a dramatic decline.
By studying the DNA of 139 living species of large mammals, scientists have been able to show that the abundances of almost all species fell dramatically about 50,000 years ago. This is according to Jens-Christian Svenning, a professor and head of the Danish National Research Foundation’s Center for Ecological Dynamics in a Novel Biosphere (ECONOVO) at Aarhus University and the initiator of the study.
“We’ve studied the evolution of large mammalian populations over the past 750,000 years. For the first 700,000 years, the populations were fairly stable. But 50,000 years ago, the populations fell dramatically and never recovered,” he says, and continues: “For the past 800,000 years, the globe has fluctuated (波动) between ice ages and interglacial periods about every 100,000 years. If the climate was the cause, we should see greater fluctuations when the climate changed 50,000 years earlier.But we don’t. Humans are, therefore, the most likely explanation.”
1. What do the underlined words “the success” mean in Paragraph 3?| A．The evolution of large mammals. |
| B．The prosperity of various habitats. |
| C．The achievement of human migration. |
| D．The progress in hunting techniques. |
| A．Populations of large mammals significantly dropped. |
| B．Living conditions of large mammals remained stable. |
| C．Global climate dramatically changed. |
| D．A large number of glaciers suddenly melt. |
| A．Species. | B．Place. | C．Time. | D．Climate. |
| A．Climate Impact on Animals |
| B．Changes of Prehistoric Environment |
| C．Evolution of Large Mammal Populations |
| D．Human Influence on Giant Mammals |
10 . For some climate challenges, there are relatively straightforward fixes. For example, renewable energy sources can already replace much of the energy needed to power buildings, cars and more.
There’s no substitute for food, but shifting what we eat is possible. If everyone on the planet ate vegetables, greenhouse gas emissions from the food system could be cut by more than half; a planet of vegetarians would reduce food emissions by two thirds. If we stopped consuming conventional food and relied on a lab-grown nutritional food instead of soil or water-produced food, we could prevent about 1 degree centigrade of future warming, according to a recent paper that considered the unique thought experiment.
“What this work says is: Hey, look, we can still get pretty big wins even if we’re not making these really big changes in dietary composition,” says Clark. “I think that’s really powerful, because a lot of people just don’t want to make those really big dietary changes, for many reasons. While vegetarian diets are becoming more common in America and some European countries, it’s absolutely ridiculous to assume that everyone will be eating a vegetarian diet 30 years from now,” he says.
Food choices are personal, deeply connected to cultural, religious, emotional, economic concerns and so much more. “Rather than dictate how to do it, it’s much better to try to give choices,” says Naglaa, a food, nutrition and environment researcher at Tufts University. This approach aims to inform people so that they can make choices that correspond with their needs and values instead of waiting for the authority’s rules and orders. As a whole, those choices can benefit both human health and the planet. For that to happen, it is necessary to work alongside large-scale efforts to reshape industrial food production.
“But what people choose to eat daily is far from insignificant,” says Clark. “We don’t all have to become vegetarians overnight. Small changes can make a big difference.”
1. How does the author show the effects of dietary changes in paragraph 2?| A．By analyzing the reasons. | B．By using a quotation. |
| C．By answering questions. | D．By listing data. |
| A．Indifferent. | B．Skeptical. | C．Favorable. | D．Negative. |
| A．Command. | B．Persuade. | C．Perceive. | D．Describe. |
| A．How small changes to our diets can benefit the planet |
| B．Small changes in life choices can make a big difference |
| C．Why renewable energy sources can reduce gas emissions |
| D．Lab-grown nutritional food could prevent future warming |
