1 . The endangered pandas in the Qinling Mountains might face a new threat: the loss of their food, bamboo, which makes up 99% of their meals.
Adult pandas spend most part of the day eating bamboo and have to take in at least 40 pounds a day to stay healthy. However, a new study published in Nature Climate Change warned that they may soon find their food gone because most of the bamboo in the Qinling Mountains might disappear by the end of the century as a result of rising temperature worldwide.
A team made up of researchers from Michigan State University and the Chinese Academy of Sciences has studied the effects of climate change on the bamboo in the Qinling Mountains. They have found that bamboo is very sensitive to climate changes. “80% to 100% of the bamboo would be gone if the average temperature rises 3.5 degrees worldwide by the end of the century,” said Liu Jianguo, one of the report’s authors.
He added, “This is how much the temperature would rise by 2100 even if all countries will keep their promises in the Paris Agreement. But you know what is happening all around the world.”
In recent years, China has been trying its best to protect the endangered pandas by setting up more and bigger natural reserves.
“But it is far from enough and the endangered pandas need cooperation from the rest of the world, because their future is not just in the hands of the Chinese,” said Shirley Martin from the World Wildlife Fund but not a member of the team.
The Qinling Mountains, in the southwest of China, are home to about 260 pandas. That is about 13% of China’s wild panda population. In addition, about 375 are living in research centers and zoos in China.
1. How many wild pandas are there in China?| A．About 260. | B．About 635. |
| C．About 2,635. | D．About 2,000. |
| A．China needs more help from the World Wildlife Fund. |
| B．It is difficult to control the temperature rise within 3.5℃. |
| C．Bamboo is sensitive to the changes of temperature. |
| D．China is making great efforts to protect the pandas. |
| A．The Qinling Mountains can provide enough bamboo for the pandas. |
| B．Pandas in the Qinling Mountains are only threatened by the loss of food. |
| C．Lots of the bamboo in the Qinling Mountains will probably disappear. |
| D．Pandas have already eaten 99% of the bamboo in the Qinling Mountains. |
| A．The Disappearance of Bamboo |
| B．Necessity to Change Pandas’ Food |
| C．A New Threat Faced by the Pandas |
| D．Efforts Made to Save Pandas |
2 . Today, we visit one of the most famous parks — Glacier Bay National Park and Preserve. This huge park in the southeastern part of the state covers more than 10 thousand square kilometers of the Alaskan wilderness. It includes mountains, glaciers, fjords (峡湾), and even rain forests. Glacier Bay supports hundreds of kinds of animals, including many species of birds, fish, bears, whales and sea lions.
As its name suggests much of Glacier Bay is covered by glaciers. A glacier is a large area of ice that moves slowly down a slope or valley, or over a wide area of land. Glaciers cover a large area of the park.
The glaciers found in the park today are what remain from an ice development known as the Little Ice Age. That period began about 4,000 years ago. During the Little Ice Age, the cold weather caused the ice to grow and develop. That growth continued until the 1700s, when the climate began to warm. The hotter temperatures caused the ice to start melting (融化). That melting led the huge glacier to divide into more than 1,000 different glaciers.
The extremely tall mountains seen in Glacier Bay were formed by the ice developing and then melting over time. The melting of the ice also created water that filled in and created the many fjords within the park. Fjords are narrow parts of the ocean that sit between cliffs or mountains.
Glacier Bay is a popular place for people searching for adventure. Some visitors choose to explore the park by kayak. The small, narrow boats offer visitors a chance to experience the park’s many fjords and its hundreds of kilometers of coastline.
1. If you pay a visit to Glacier Bay, you will find ________.| A．it almost covers the whole Alaskan wilderness |
| B．the rain forests are rare in such conditions |
| C．there live numbers of kinds of animals |
| D．there are more birds than other species |
| A．Some glaciers existed there long long ago. |
| B．Greenhouse effect has affected the glaciers. |
| C．The glaciers will disappear in the soon future. |
| D．Only 1,000 large glaciers are left at present. |
| A．They are formed on the top of mountains. | B．The melting of the ice is also called fjords. |
| C．Water is the source of creating many fjords. | D．Fjords move as the oceans flow around. |
| A．To do a research about Glacier Bay. | B．To warn visitors there are too many dangers. |
| C．To show Glacier Bay has a long history. | D．To introduce Glacier Bay to readers. |
Horses are picky eaters
Horses have an even better sense of smell than humans do. When horses raise their noses and open their nostrils (鼻孔), their nervous system allows them to sense smells we can’t sense. This might explain why they refuse dirty water and carefully move around meadows, eating only the tastiest grasses, experts say.
Whale says thanks
In 2018, a whale expert spotted a humpback whale trapped in a fishing net and spent an hour freeing it. Afterward, in an hour-long display of thanks, the whale swam near their boat and leaped into the air about 40 times.
Pandas like to be naughty
Is there anything more lovely than a baby panda, except maybe a human baby? In fact, baby pandas sometimes behave like human babies. They sleep in the same positions and value their thumbs. Pandas are shy by nature for its shy behaviors such as covering its face with a paw or ducking its head when confronted by a stranger.
A cat honors its owner
Paper towels, and a plastic cup are just a few of the gifts that Toldo, a devoted three-year-old gray-and-white cat, has placed on his former owner Iozzelli Renzo’s grave every day since the man died in September 2018. Renzo adopted Toldo from a shelter when the cat was three months old, and the two formed an inseparable bond. After Renzo passed away, Toldo followed the coffin to the cemetery, and now “stands guard” the grave for hours at a time.
1. What can horses do to pick delicious grasses?| A．Feel them. |
| B．Taste them. |
| C．Smell them. |
| D．Observe them. |
| A．They are clever. |
| B．They have a grateful heart. |
| C．They are active and lovely. |
| D．They have a good sense of smell. |
| A．The whale |
| B．The cat. |
| C．The horse. |
| D．The panda. |
4 . Urban Wildlife
Cities are diverse ecosystems. In addition to visitors, a large number of species share our urban areas. As our cities spread, we need to think about what it is like for other species to have human neighbors.
Cities are built for humans.
There are also structures built with the aim of bringing wildlife into the city. The Olympic Forest Park in Beijing is a good example. The park used native plants, and created open and natural spaces for wildlife. The result is a zone in Beijing with over 160 species of birds. In many ways, the park is the opposite of a zoo.
If we learn to share our space, we can become better neighbors of the wildlife around us.
| A．They are built to protect birds. |
| B．Our actions sometimes help other species. |
| C．If we do not, more species will become extinct. |
| D．They do not always provide suitable habitats for wildlife. |
| E．Instead of being kept in cages, wildlife can move more freely. |
| F．At first, people were afraid of the bats and tried to get rid of them. |
| G．They would sit on it and their droppings would fall into the water. |
6 . How many times have you gone outside only to get your foot stuck in chewing gum (口香糖) on the sidewalk, or discovered a mass of Bubbalicious beneath (在……之下) a table or desk? As far as environmental pollution goes, chewing gum is far from our largest problem —but for the average pedestrian (行人), it could well be among the most annoying.
Chewing gum causes plenty of messes for local governments, too. When people leave their used gum on sidewalks, it’s up to cities to pay for clean-up efforts: in the United Kingdom it costs about 150 million pounds every year to cover the costs of removing the sticky gum from public walkways and facilities.
But 25-year-old Anna Bullus has come up with a solution that could turn those used pieces of bright pink gum a lovely shade of green. She spent eight months collecting old gum and working with it in a lab, eventually creating a ball from the material, which she mixed with other materials to create the Bullus Recycled Gum Polymer (BRGP)
“Yes, everyone thought I was mad and a little bit disgusting,” she told The Guardian. But Bullus’ effort has paid off. she’s used the BRGP to create pink bubble-shaped bins (垃圾箱) which can be used to collect used pieces of gum. She’s set up her “bubble bins” around Orpington College as a trail, but hopes to roll them out in more locations before long. Once the bins are full, both the bins and the gum inside them will be recycled to produce more BRGP— at which point, the possibilities are almost endless.
“The amazing thing is that you can use it for any plastic product.” Bullus said. “I’d love to do some waterproof boots, for example. Gum boots, in fact.”
1. What does the author say about chewing gum in Paragraph 2?| A．It is a bad habit. | B．It is hard to be removed. |
| C．It is very popular in the U. K. | D．It is the government’s headache. |
| A．It’s a tool used to collect waste. | B．It’s a new brand of chewing gum |
| C．It’s a mixture of recyclable materials. | D．It’s a product only made from used gum |
| A．Creative and determined. | B．Wise and lucky. |
| C．Honest and helpful. | D．Active and Humorous. |
| A．As for environmental pollution, chewing gum has been the largest problem so far. |
| B．An idea struck Anna that she could make full use of the used gum. |
| C．In many people’s opinion, it is not a good idea to collect used gum and work with it. |
| D．To some degree, Anna has managed to handle the problem of chewing gum. |
7 . Amsterdam is one of the most popular travel destinations in the world, famous for its beautiful canals, top art museums, cycling culture and so on. It is the capital city of the Netherlands and often referred to as the “Venice of the North” because of its expansive system of bridges and canals. Here are some of the key points to remember as you plan your trip to Amsterdam.
Must-See Attractions
Most visitors begin their Amsterdam adventure in the Old Centre, which is full of traditional architecture, shopping centers, and coffee shops. You’ll also want to check out Amsterdam’s Museum Quarter in the South District, which is great for shopping at the Albert Cuyp Market and having a picnic in the Vondelpark. The top museums to visit there are the Rijksmusuem, the Ann Frank House, and the Van Gogh Museum.
If You Have Time
There are several other unique districts in Amsterdam, and you should try to explore as many of them as time allows. The Canal Ring is a UNESCO World Heritage Site that was originally built to attract wealthy home owners and is a center for celebrity spotting and nightlife today. The Plantage area has most of the city’s museums and the botanical gardens.
Money Saving Tips
●Unless you really want to see the tulips(郁金香) blooming, avoid booking between mid-March and mid-May. This is when hotel and flight prices rise.
●Look for accommodations in Amsterdam’s South District, where rates are generally cheaper than in the city center.
●Buy train tickets at the machine instead of the counter to save a bit of money.
●Instead of hiring a tour guide, hop on a canal boat. They’re inexpensive and will give you a unique point of view of the city.
Check out our homepage to view price comparisons for flights, hotels, and rental cars before you book.
1. What can be learned about Amsterdam from this passage?| A．The Van Gogh Museum lies in the South District. |
| B．The Canal Ring is a place to attract garden lovers. |
| C．The Old Centre is a UNESCO World Heritage Site. |
| D．Amsterdam is called the “Venice of the North” because of its location. |
| A．arrange a guided tour | B．buy train tickets at the counter |
| C．reserve a hotel in the South District | D．book flights between mid-March and mid-May |
| A．A magazine. | B．An essay. | C．A report. | D．A website. |
8 . Scientists say the plant enset, an Ethiopian staple (主食), could be a new superfood and a lifesaver in the face of climate change. “This is a crop that can play a really important role in addressing food security and sustainable development,” said a university professor in Awasa, Ethiopia.
Enset, or “false banana”, is a close relative of the banana but is consumed only in one part of Ethiopia. The banana-like fruit of the plant is inedible (无法食用的), but the stems and roots can be processed to make porridge and bread.
However, Ethiopia is isolated (隔离) by dry lowlands, which are unsuitable for enset to grow. And the procedures for enset raising and preparing require special knowledge. Therefore, despite its wild relatives distributing across Africa, enset is only used as a crop in Ethiopia and has never been widely adopted elsewhere.
Using agricultural surveys and modelling work, scientists found the crop could potentially feed more than 100 million people and boost food security in Ethiopia and other African countries.
Study researcher Dr James Borrell, of the Royal Botanic Gardens, said planting enset as an alternative crop for tough times could help support food security. “It’s got some really unusual characteristics that make it absolutely unique as a crop,” he said. Reaching ten meters tall, as few as 15 enset plants can feed a person for a year. Also, it has flexible harvest times, stores well, and is relatively drought and disease tolerant. All these features have earned it the name, “the tree against hunger”.
There is growing interest in seeking new plants to feed the world. Nearly half of all the calories we eat come from three species - rice, wheat, and corns. “We need to diversify the plants we use globally as a staple because all our eggs are in a very small basket at the moment,” said Dr Borrell.
1. What can we know about enset?| A．It is widely consumed in Ethiopia. | B．Its stems and roots can serve as a staple. |
| C．It is mainly grown in dry lowlands. | D．It distributes throughout the world. |
| A．Lack of related knowledge. | B．Poor quality of farmland. |
| C．Low productivity. | D．Strict storage condition. |
| A．Its advantages. | B．Its edibility. | C．Its variety. | D．Its distribution. |
| A．People are fed up with existing staples. | B．A world of biodiversity is needed. |
| C．Crop varieties should be increased. | D．Food security has been addressed. |
9 . People have been wondering why elephants do not develop cancer even though they have lifespans(寿命)that are similar to humans, living for around 50 to 70 years.
Now scientists believe they know why. A team at the University of Chicago, US has found that elephants carry a large number of genes that stop tumors(肿瘤)developing. To be precise, they found 20 copies of an anti-tumor gene called TP53 in elephants. Most other species, including humans, only carry one copy.
According to the research, the extra copies of the gene improved the animal’s sensitivity to DNA damage, which lets the cells quickly kill themselves when damaged before they can go on to form deadly tumors.
“An increased risk of developing cancer has stood in the way of the evolution of large body sizes in many animals,” the study author Dr Vincent Lynch told The Guardian. If every living cell has the same chance of becoming cancerous(癌变的),large creatures with a long lifespan like whales and elephants should have a greater risk of developing cancer than humans and mice. But across species, the risk of cancer does not show a connection with body mass.
This phenomenon was found by Oxford University scientist Richard Peto in the 1970s and later named “Peto’s paradox(悖论)”. Biologists believe it results from larger animals using protection that many smaller animals do not. In the elephant’s case, the making of TP53 is nature’s way of keeping this species alive.
The study also found that when the same genes were brought to life in mice, they had the same cancer resistance as elephants. This means researchers could use the discovery to develop new treatments that can help stop cancers spreading or even developing in the first place.
“Nature has already figured out how to prevent cancer,” said Joshua Schiffman, a biologist at the School of Medicine, University of Utah, US. “It’s up to us to learn how different animals deal with the problem so that we can use those strategies to prevent cancer in people.”
1. Why are elephants unlikely to develop cancer?| A．Certain genes in their body kill existing tumors. |
| B．They have a rather large body size. |
| C．They carry many genes to prevent tumors developing. |
| D．Their genes suffer no DNA damage. |
| A．The huge body mass. |
| B．Deadly tumors. |
| C．Cells killing themselves. |
| D．Sensitivity to DNA damage. |
| A．The risk of cancer is not related to body size. |
| B．Larger animals have protection from TP53. |
| C．Larger animals suffer the same risk of cancer as smaller ones. |
| D．The larger animals are, the bigger risk of cancer they will have. |
| A．Depending on nature is surely enough to fight against cancer. |
| B．The TP53 genes have proved useful in stopping cancer in people. |
| C．The extra copies of elephants’ genes are used to cure cancer patients. |
| D．Humans are expected to prevent cancer with the making of TP53. |
10 . Tropical(热带的)birds deep in Brazil’s Amazon rainforest are shrinking as the world’s climate changes. Researchers studied data for 77 tropical bird species over the past 40 years and found that all of them had lost body mass, with some species losing nearly 2% of their weight per decade.
A 2019 study of birds that had crashed into buildings in Chicago, Illinois, found that they’d lost mass over a 40—year period, but those species were migratory(迁徙的). However, why the birds changed in that way was unknown. Therefore, researchers decided to examine the records of 15, 000 non-migratory birds living in a rainforest within a few hours’ drive from Manaus in Brazil.
The average temperature of the birds’ habitat is 1℃ warmer in the wet season and 1. 65℃ warmer in the dry season compared with that in 40 years ago. What’s more, 13% more rain falls in the wet season and 15% less in the dry season. The birds have lost mass more sharply following extremely dry or wet seasons. This could be a short-term response to changes in their environment, such as a lack of rainfall causing a decline in the number of insects that the birds feed on.
“Mass is a generally good indication of body condition in birds, says Vitek Jirinec at the Integral Ecology Research Center in California, who led the study. "If they’re simply not getting enough to eat, you’d expect them to lose weight.”
Birds of the same species are generally larger at higher latitudes. The leading theory is that their smaller surface — area — to — volume ratio（表面积和体积比）allows them to better conserve heat. The opposite would help smaller species in hot climates to cool and could explain why birds are getting smaller as the climate warms, says Jirinec.
The marked physical change during just four decades show why stopping destroying trees alone won’t prevent the ongoing extinctions of animal species across the world, says Camila Gomez, a scientist who studies evolutionary changes in birds. "This study also shows how human-caused changes in climate are contributing to observed population declines in tropical birds," says Gomez.
1. Why did the researchers study the non-migratory birds?| A．To make the conclusion of the 2019 study. |
| B．To prepare them for their future migration. |
| C．To find the reason for their physical change. |
| D．To seek a way to save the Amazon rainforest. |
| A．High temperatures are rarely seen. | B．It seems much drier in wet seasons. |
| C．Weather patterns get more extreme. | D．Rainfall is increased in dry seasons, |
| A．It enables them to hide easily. | B．It makes them feel less cold. |
| C．It keeps them in good shape. | D．It helps them lose extra heat. |
| A．Global Warming Leads to Population Declines in Birds |
| B．Climate Change Is Causing Some Birds to Lose Weight |
| C．Tropical Birds Are Struggling to Survive Dry Climates |
| D．Migratory Birds Are Experiencing Big Physical Changes |
