Eradajere Oleita thinks she may have a solution     1     two of her country’s problems: rubbish and poverty (贫困). It’s called the Chip Bag Project. The 26-year-old student and environmentalist from Detroit is asking local chip lovers     2     (donate) their empty chip bags rather than throw them into the trash so she can turn them into sleeping bags for the homeless.

Chip eaters drop off their empty bags at two locations in Detroit: a print shop and a clothing store, where Oleita and other     3     (volunteer) collect them. After they clean the chip bags in soapy hot water, they cut them open, lay them flat, iron (熨) them together and use liners from old coats to line the insides.

It     4     (usual) takes about four hours to sew (缝) a sleeping bag, and each takes around 150 to 300chip bags, depending on whether they’re single-serve     5     family size. The result     6     (be) a sleeping bag that is waterproof (防水的), lightweight, and easy to carry around.

Since its start in 2020, the Chip Bag Project     7     (collect) more than 800,000 chip bags and created 110 sleeping bags.

Sure,     8     would be simpler to raise the money to buy new sleeping bags. But that’s only half the goal for Oleita—whose family moved to the United States from Nigeria ten years ago with the hope of     9     (have) a better life—and her volunteer helpers. “We are working to make a     10     (different) not only socially, but environmentally,” she says.

2 . I fell in love with rhinos when I worked in a zoo in the 80s, and spent much of the next 20 years as the keeper of the largest captive (圈养的) group of rare black rhinos.

There’s a popular misconception that rhinos are aggressive and stupid, but I found them sensitive and affectionate animals. Weighing over a ton, black rhinos are unexpectedly agile (敏捷的) and have an unpredictable nature — but, given reassurance, they tend to believe people. In the past few decades, their numbers have dropped dramatically. In recent years, I’ve helped look after rhinos being moved to the reserve so they can form new populations in countries that have few left. Last year, I helped on a project to fly five black rhinos from a private reserve in South Africa to the Serengeti National Park. Once there, the animals had to be kept captive for a few weeks to adapt to the new environment, in which time they lived in “bomas” — wooden enclosures with “bedrooms”, designed to create a calm space.

A couple of weeks before their planned release, the sky filled with smoke. Watching the flames rushing through the bush toward the bomas, I froze. Terrified that it would catch fire, my instinct was to release the rhinos, but they hadn’t yet been fitted with transmitters (发信器). If I let them out into a bushfire and they were injured, we’d have great difficulty tracking them down. So I dashed back to the bomas and called the rhinos to the bedrooms. Sensing the fear in my voices, they moved without hesitation and remained astonishingly calm. It was crucial the rhinos didn’t panic — they can easily hurt each other if they do.

That we and the rhinos had escaped safe and sound was a miracle. The teamwork of everybody there played a large part, and the rhinos were very much a part of that team. The relationships we’d built with them had proved crucial — had they or we panicked, all our work would have been in vain.

7 . 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.”

8 . Afroz Shah, a lawyer in Mumbai, hasn’t had a weekend off in four years. But he hasn’t spent this time preparing for _________.

His mission? Saving the world’s oceans from _________ pollution.

It’s a calling he found in 2015 after moving to a community in Mumbai called Versova Beach. He had played there as a child and was_________to see how much it had _________. The sand was no longer _________ because it was covered by a layer of garbage more than five feet thick — most of it plastic waste.

“The whole beach was like a_________of plastic,” he said. “It hurt me. The _________ mess.” What Shah had seen is part of a global environmental crisis. More than 8 million tons of plastic _________in the world’s oceans each year. It’s predicted that by 2050, there will be more plastic in the ocean than fish. “Plastic in the ocean is a _________. And the sea species have no choice at all, ” Shah said. “We are ______________ their habitats.”

In October 2015, Shah began ________________ up plastic waste from the beach every Sunday morning. At first, it was just him and a neighbor, and then he began calling on others to join in. Word ________________ and with the help from social media, more volunteers got ________________.

For Shah, the work has always been a ________________ journey, but it has earned global attention. After he was ________________ as a Champion of the Earth by the United Nations in 2016, Shah now devotes nearly all of his free time to this ________________.

He’s now spent 209 weekends on this mission, ________________ more than 200,000 volunteers, some of whom are young students, to join him in what’s been called the world’s biggest beach cleanup. By October 2018, Versova Beach was ________________ clean and Shah’s cleanups expanded to another beach as well as a stretch of the Mithi River and other regions of India.

“This world talks too much. I think we must talk ________________ and do action more, ” he said when interviewed by CNN in October 2019.“We are a smart species. Well adapt. We’ll learn. And with these youngsters rising up, I see ________________.”

On February 16, 1861, a big earthquake struck Sumatra, an Indonesian island. The earthquake shook the western side of the island,     1     (cause ) a tsunami. That wall of water poured onto shore, destroying towns and taking thousands of    2     (life) .

Recently, though, a team of scientists discovered that another earthquake occurred before this deadly event. According to the record, that earthquake     3     (start) in 1829 and lasted for 32 years but no one felt even one shake. This kind of slow-moving earthquake    4     (call) “silent earthquakes” because no instrument can find them. Scientists have only begun discovering them because    5     the advances in GPS technology in the last twenty years.

    6     (find) out what is going on under the ground, scientists need to study earthquakes. Every earthquake, either small     7     big, can teach scientists something about how much the ground will shake in the future. Unluckily, no one can predict (预测) when an earthquake will hit. Scientists just have to prepare to study all earthquakes    8     hit.

But silent earthquakes like the one in Sumatra change the game for scientists. These silent earthquakes happen all over    9     world. Sometimes, a silent earthquake happens just before a regular one, both of which might be related. By studying silent earthquakes, scientists hope to better understand regular earthquakes and    10    (possible) predict them.

10 . After years of heated debate, gray wolves were reintroduced to Yellowstone National Park. Fourteen wolves were caught in Canada and transported to the park. By last year, the Yellowstone wolf population had grown to more than 170 wolves.

Gray wolves once were seen here and there in the Yellowstone area and much of the continental United States, but they were gradually displaced by human development. By the 1920s, wolves had practically disappeared from the Yellowstone area. They went farther north into the deep forests of Canada, where there were fewer humans around.

The disappearance of the wolves had many unexpected results. Deer and elk populations — major food sources (来源) for the wolf — grew rapidly. These animals consumed large amounts of vegetation (植被), which reduced plant diversity in the park. In the absence of wolves, coyote populations also grew quickly. The coyotes killed a large percentage of the park’s red foxes, and completely drove away the park’s beavers.

As early as 1966, biologists asked the government to consider reintroducing wolves to Yellowstone Park. They hoped that wolves would be able to control the elk and coyote problems. Many farmers opposed the plan because they feared that wolves would kill their farm animals or pets.

The government spent nearly 30 years coming up with a plan to reintroduce the wolvers. The U.S. Fish and Wildlife Service carefully monitors and manages the wolf packs in Yellowstone. Today, the debate continues over how well the gray wolf is fitting in at Yellowstone. Elk, deer, and coyote populations are down, while beavers and red foxes have made a comeback. The Yellowstone wolf project has been a valuable experiment to help biologists decide whether to reintroduce wolves to other parts of the country as well.