1 . Bangladesh's floating gardens, built to grow food during flood seasons, could offer a continuous solution for parts of the world which are likely to suffer from flooding because of climate change, a new study has found.
Bangladesh's floating gardens began hundreds of years ago. The gardens are made from native plants that float in the rivers and operate almost like rafts (筏), rising and filling with the waters. Historically, they were used to continue growing food during rainy seasons when rivers were filled with water.
The farmers layer the plants about three feet deep, creating a version of raised-bed gardens that float in the water. Then, they plant vegetables inside those rafts. As the raft-plants rot away, they release nutrients, which help feed the vegetable plants.
But as climate change affected the volume of water in those rivers, the researchers wanted to understand whether Bangladesh's floating gardens could be a continuous farming practice. They interviewed farming families and found strong evidence that floating gardens provide stability, both in the amount of food available to feed rural populations and in a farming family's income.
They found that farmers typically use hybrid (杂交) seeds, which must be repurchased each year, to grow a diverse range of vegetables in the floating gardens. The gardens are also sensitive to pests, so farmers end up spending some money on both pesticides and fertilizers. But even with those expenses, they found, benefits outweighed costs. One farmer told the research team that he earns up to four times as much money from the gardens as from traditional rice fields.
However, before gaining profits, farmers often take out high-interest loans (贷款) to cover the investment costs of filling the beds and stocking them with plants. Luckily; there are also lower-interest loans from responsible government or non-governmental organizations, which could ease that burden.
1. How do vegetable plants grow according to the text?| A．By absorbing nutrition from raft-plants. | B．By taking shelter from climate change. |
| C．By living together with hybrid seeds. | D．By moving up and down with raised beds. |
| A．“Our life becomes tough when rivers flood.” | B．“Fewer vegetables are planted when water rises.” |
| C．“We harvest much more food during rainy seasons.” | D．“Climate change has little influence on our income.” |
| A．Affected. | B．Brought. | C．Beat. | D．Equaled. |
| A．A solution to climate problem has been found. | B．The gardens are built with rotted native plants. |
| C．Farmers earn more from traditional rice fields. | D．Low-interest loans lighten the stress of farmers. |
2 . The weather is getting hotter. You are thirsty playing basketball or riding home from school. A cold drink may be just the thing. But be careful what you are drinking. Something that looks cool may not be good for your health. There are plenty of “energy drinks” on the market. Most of them have beautiful colors and cool names. The lists on them tell you they are helpful to your health. Sounds great!
But after a careful check you may find that most energy drinks have lots of caffeine(咖啡因) in them. These drinks are especially aimed at young people, students, busy people and sports players. Makers sometimes say their drinks make you better at sports and can keep you awake.But be careful not to drink too much. Caffeine makes your heart beat fast. Because of this, the International Olympic Committee(OC) has limited(限制) its use. Caffeine in most energy drinks is at least as strong as that in a cup of coffee or tea. Possible health dangers have something to do with energy drinks. Just one box of energy drink can make you nervous, have difficulty sleeping and can even cause heart problems.Scientists say that teenagers should be discouraged from taking drinks with a lot of caffeine in them.
1. Many people like drinking energy drinks because of the following EXCEPT that______.| A．they have beautiful colors and cool names |
| B．they have lots of caffeine |
| C．they can keep them awake and better at sports |
| D．they are said to be helpful to health |
| A．Encouraged. |
| B．Stopped. |
| C．Helped. |
| D．Disliked. |
| A．Advertisements are important in getting people to buy energy drinks. |
| B．Energy drinks are helpful to teenagers' study. |
| C．Sports players need to drink a lot of energy drinks. |
| D．Energy drinks are especially aimed at teenagers. |
| A．What's the Use of Energy Drinks? |
| B．Who Can Drink Energy Drinks? |
| C．What's That in Energy Drinks? |
| D．Why Can't We Buy Energy Drinks? |
3 . The ancient village of Machu Picchu is one of the most popular tourist destinations in South America. It’s in Peru, high in the Andes Mountains, 8, 000 feet above sea level.
The village contains 200 buildings. Houses are in groups, and each house has a large courtyard inside its walls. The Incas(印加人) used the areas outside the groups of houses to grow corn and potatoes and to raise animals. The Incas were very good at building strong walls. Visitors to Machu Picchu still cannot fit a knife between the stones of a village home.
Machu Picchu seemed to be a healthy, busy village. So why was it lost? That is a mystery, but experts have some ideas. Machu Picchu was hard to reach. Few people outside the village knew about it. Experts think that many residents died of disease. Others fought a war. The survivors left the village.
The tourists are good for Peru’s economy, but they are not good for Machu Picchu. The village is old and fragile. Tourists damage the ruins. Thousands of footsteps from visitors wear down the walkways in the village. Salt and oil from people’s hands damage the walls. Air pollution from buses hurts the stones. Tourists do not want to damage the village, but they want to see this beautiful, ancient place.
The Peruvian government and conservation groups are trying to solve the problem. A group from the United Nations wants to limit the number of tourists each year. They also want cars and buses to use cleaner fuel.
1. What crops did the Incas grow?| A．Rice and beans. | B．Tomatoes and peas. |
| C．Wheat and peas. | D．Potatoes and corn. |
| A．The Incas knew how to make good use of the land. |
| B．Visitors still cannot fit a knife between the stones. |
| C．Footsteps wear down the walkways in the village. |
| D．Each house has a large courtyard inside its walls. |
| A．Beautiful. | B．Terrible. | C．Clean. | D．Weak. |
| A．Air pollution. | B．Feet on the walkways. |
| C．The shape of the land. | D．Hands on the walls. |
4 . One day, Amanda was diagnosed (诊断) with cancer of an early stage. During this time, she was admitted to a college. She planned to save money to meet the college expense and then seek medical treatment for the cancer.
Her father, Clint and her friends didn’t want her to put off her treatment due to the expense. They took matters into their own hands and started a GoFundMe campaign. A longtime friend of the family was cofounder of a group named Praynksters, known for random acts of kindness. The friend decided to use their own group to help the family. The group came up with the creative idea to spread the word and invite families, friends, and strangers who wanted to help to take part in a donation activity. The event induced the enormous assistance from the local community.
Clint and Amanda were moved as the crowd passed by and the donations poured in. The event brought the family over $13, 000 in donations to go towards her medical treatments. The generous act of kindness gave the family a comforting, and optimistic feeling during a time when all hope seemed lost. Clint said that Amanda struggled with the idea of asking for help. She felt guilty and undeserving compared to others who are also struggling. She is still humbled by it all.
After several months of treatment, life for the family has started getting back to their normal routine. Once Amanda got her strength back, she returned to school and completed her bachelor's degree. The family is now inspired to volunteer in their local neighborhood and contribute to crowdfunding (众筹) efforts. They are grateful for the opportunity to give back and help others as many have helped them.
1. Why did Amanda postpone her treatment of cancer?| A．She didn't care about her disease. |
| B．She had to take care of her family. |
| C．She was in a bad economic situation. |
| D．She couldn’t find an effective treatment. |
| A．Brought about. | B．Made up. |
| C．Gave away. | D．Set about. |
| A．Shameful but caring. |
| B．Kind-hearted and grateful. |
| C．Curious and warm-hearted. |
| D．Hard- working and humorous. |
| A．It's quite easy to cure Amanda’s cancer. |
| B．Praynksters is a nonprofit organization funded by Clint. |
| C．Volunteering is very popular in Amanda's community. |
| D．A GoFundMe campaign is actually a crowdfunding activity. |
5 . It is among nature’s greatest spectacles. Each year, thousands of sea turtle mothers clamber ashore, dig into the sand to lay their eggs, and then return to the sea. After being incubated（孵）for around two months, the eggs hatch and the tiny turtles strive to reach the water.
Approximately 90 percent of the sea turtle nesting in the United States happens on Florida's beaches , according to the Sea Turtle Conservancy, a Gainesville-based research and conservation organization. During the nesting season, which runs from March through October, the sands are normally crowded with humans. However, this year the coronavirus pandemic severely reduced travel and required some states to close their beaches for weeks. While this sounded disappointing to the visitors, it may have been a boon to the sea turtles.
For turtle mothers, there can be " false crawls" , in which a female encounters a distraction between the water and a potential nesting site. The crowded beaches would interrupt the sea turtles' plan, sending them back to the ocean without laying eggs.
“ In terms of a successful rate of nesting, we actually did find a significant difference during the beach closures and then after," says Justin Perrault, director of the organization, “We have observed approximately 17,000 nests along Juno, Jupiter-Carlin, and Tequesta beaches this year. During the closures, loggerheads, one of the commonly seen turtles on Florida's beach, successfully nested 61 percent. When the beaches reopened, that number dropped to 46 percent. ”
Jimena Gutierrrez, a Sea Turtle Conservancy biologist also expresses her opinion, “ Normally the turtles are conserved because we have a lot of people coming to see them. With fewer tourism dollars supporting local workers, we are worried about the conservationists as well as the turtles. But maybe in the long run, we will see good numbers because there is less boat traffic in the ocean.
1. What does the underlined word “boon” in Paragraph 2 probably mean?| A．Cure. | B．Option. |
| C．Blessing. | D．Challenge. |
| A．Closures should be expanded for turtles, nesting. |
| B．This year has witnessed the highest nest rate in history. |
| C．The nest rate has remained steady over the whole nesting season. |
| D．Less human disturbance has led to more successful nesting. |
| A．Anxious. | B．Ambiguous. | C．Indifferent. | D．Objective. |
| A．www. sealifeconservation. com. | B．www. worldissues. com. |
| C．www. scienceforstudents. com. | D．www. newsflash. com. |
6 . Microplastics, as the name implies, are tiny plastics that result from both commercial product development and the breakdown of larger plastics. Officially, they are defined as plastics less than five millimeters in diameter(直径). .
The problem with microplastics is that — like plastic items of any size — they do not readily break down into harmless molecules (分子). Plastics can take hundreds or thousands of years to decompose, and in the meantime, cause damage to the environment. On beaches, microplastics are visible as tiny colored plastic bits in sand. In the oceans, microplastics pollution is often consumed by sea animals.
Some of this environmental pollution is from littering, but much is the result of storms and winds that carry plastics into our oceans. Single-use plastics, plastic items meant to be used just once and then thrown away, are the primary source of microplastics in the environment.
Microplastics have been detected in sea animals, in commercial seafood, and even in drinking water. Alarmingly, standard water treatment facilities cannot remove all the traces( 痕迹) of microplastics. To further complicate matters, microplastics in the ocean can combine with other harmful chemicals before being swallowed by animals.
Scientists are still unsure whether consumed microplastics do damage to human or animal health - and if so, what specific dangers they may cause. Even so, many countries are taking action to reduce microplastics. A United Nations resolution has discussed the need for rules to reduce microplastics to oceans, wildlife, and human health.
1. What does the underlined word “decompose” mean in Paragraph 2?| A．Break down. | B．Fade away. . |
| C．Dry up. | D．Give out. |
| A．Water treatment facilities fail to remove their traces. |
| B．People might consume them through drinking water. |
| C．They can combine with other chemicals inside animals. |
| D．They have been a blow to commercial seafood industry. |
| A．Many governments turn a blind eye to microplastics. |
| B．It has been confirmed that consumed microplastics are harmful. |
| C．Measures will be taken to reduce microplastics in the environment. |
| D．Scientists have known what specific dangers microplastics may cause. |
| A．inform the public of an environmental issue |
| B．arouse the awareness of protecting seawater |
| C．persuade scientists to look into microplastics |
| D．introduce the microplastics treatment methods |
7 . Mountain gorillas (大猩猩) have been caught on camera as they“sing”during their supper,a behavior that has never before been documented on video. Filmmakers shot the astonishing footage of gorillas with the help from a very special camera: a robotic“spy”designed to look like a young gorilla.
Creating a realistic robot spy that could fool a gorilla means designing a face that is mobile and expressive, particularly around the eyes. “ Eye communication is very important among gorillas," said“Spy in the Wild" producer Matt Gordon.“You'll see in the film the gorillas came straight over to our spy gorilla and looked right into its eyes. So we made sure that the gorilla had the most amount of detail put into the face.”
Infiltrating communities of animals that live in groups requires a robot to smell like its animal subjects in order to get close to them, Sometimes animal waste is applied to the robot to allow it to be accepted into the group.
One tricky challenge for the gorilla robot is that it has to pass inspection by the chief male.“We wanted to make sure that we were not being threatening,so we avoided the stare of our spy gorilla ,”Gordon said. This display of obedience (顺从) convinced the male that the robot wasn't a danger; he then signaled to the troop that it was safe for them to take a closer look at the "stranger".
The robot was also able to beat its chest to respond to a baby gorilla' s chest- beating, allowing the filmmakers to shoot a rare sight of their playtime. “A young gorilla came over and beat its chest. For a baby gorilla, that means‘I want to play' ,and if our gorilla was lifeless, not moving, the gorilla would have lost interest. But our spy gorilla was able to beat its chest too,” Gordon said.
1. Why was the robotic spy made?| A．To record the songs gorillas sang at supper. | B．To produce a film called Spy in the Wild. |
| C．To test the spy's ability to communicate. | D．To study the environment gorillas live in. |
| A．Fitting in. | B．Focusing on. | C．Playing with, | D．Learning about. |
| A．By avoiding staring at the chief. | B．By beating its chest like a baby. |
| C．By putting some waste on itself. | D．By signaling to other gorillas. |
| A．Unusual daily behavior of mountain gorillas. |
| B．Scientific research on living habits of gorillas. |
| C．The procedures for making a robotic gorilla. |
| D．Ways to make a robotic spy close to gorillas. |
8 . Covid-19 is not the only catastrophe that 2020 has brought. In parts of Asia and east Africa, swarms（成群）of locusts（蝗虫）have destroyed fields. Locusts are usually inoffensive, spread-out creatures that do not stay far from the place where they were born. But under the right circumstances, that is, a heavy rain and a following boom in plant growth, they can be gregarious. Millions of the insects gather in swarms which can fly more than 100km in a day.
In a paper published in Nature, Xiaojiao Gou and a group of other researchers clarify part of the biochemical system that drives that transformation. Dr Gou and her colleagues collected 35 chemicals acquired from the bodies and wastes of locusts. When tested, locusts were strongly attracted to just a chemical, one called 4-vinylanisole （4VA）. Scientists already know that swarming is a response to overcrowding, and Dr Gou and her colleagues found that 4VA production rose with population enlargement. Further investigation confirmed the odour receptor （气味受体）on the insects' antennae（触角）is sensitive to the chemical.
Humans have tried everything they can to deal with locust swarms, with mixed results. Man-made version of 4VA might be used to bait（诱捕）traps. If 4VA turns out to be a language that all locusts understand, then it may help humans persuade them to abandon their gregarious ways, and return to a peaceable life of being alone.
1. What does the underlined word in Paragraph 1 mean?| A．Flexible. | B．Starved. |
| C．Aggressive. | D．Gathering. |
| A．Locusts can release 35 chemicals from their bodies. |
| B．4VA is one of the chemicals strongly attracting locusts. |
| C．4VA will be produced more when locusts' number increases. |
| D．The transformation of locusts affects the biochemical system. |
| A．Humans have got the methods of killing locusts. |
| B．Man-made version of 4VA will be introduced to market. |
| C．Scientists have had a new breakthrough to transform locusts' habitats. |
| D．It remains to be proved whether 4VA is a language that locusts understand. |
| A．The harm caused by locust swarms. |
| B．The ways to prevent locust swarms. |
| C．The process of locusts' transformation. |
| D．The finding of 4VA attracting locust swarms. |
9 . It's long been understood that there is a connection between memory problems and diabetes(糖尿病), a disorder characterized by excessively high blood sugar.Sugar provides the body with fuel for various processes, including memory processing. In fact, glucose(葡萄糖)carried in the blood stream supplies the brain with 90 percent of the energy it requires to function properly.
In order to fuel those processes, glucose has to get from the blood to the tissues, where it can be broken down and put to work. High blood sugar levels, such as in diabetes, are an indicator that a body is experiencing difficulty moving sugar from the blood to the tissues.
However, some non-diabetics have a less severe form of high blood sugar, a condition called impaired glucose tolerance. And it is this condition that seems to be the cause of memory problems in a significant number of non-diabetic elderly people who experience memory difficulties.
Subjects were given glucose intravenously(静脉注射), and then researchers measured how quickly glucose moved from the blood to the tissues. Next, the subjects were tested for overall cognitive functioning and the ability to recall short paragraphs. It turned out that subjects who scored lowest in memory recall tests also showed impaired glucose tolerance.
In addition, brain scans demonstrated that these same subjects each had a significantly smaller hippocampus, a brain area important to learning and memory. The researchers hypothesize that impaired glucose tolerance may over time cause damage and atrophy (萎缩) to the hippocampus.
What can a body do to prevent this? A healthy diet and exercise can help maintain good glucose tolerance, perhaps preventing gradual memory decline.
1. What does a high blood sugar level suggest?| A．A body has already developed diabetes. |
| B．Problems arise when glucose is transported. |
| C．Glucose begins to reproduce itself in the blood stream. |
| D．Fewer fuels are needed for a body to function properly. |
| A．It may gradually cause damage to people's brains. |
| B．It is associated with a minor disorder of blood pressure. |
| C．People with this condition have a high risk of falling down. |
| D．It is an acute disease caused by a shortage of regular workout. |
| A．Explain in detail. | B．Jump to a conclusion. |
| C．Make an assumption. | D．Declare with certainty. |
| A．The causes and symptoms of diabetes. |
| B．An experiment to find a cure for diabetes. |
| C．The connection between memory and sugar. |
| D．A study to differ diabetes from impaired glucose tolerance. |
10 . Asia has long tradition of tea-drinking. And China is no exception.
However, lately more and more Chinese people are turning to a different drink. Coffee has become an increasingly popular choice of Chinese people living abroad and in the country’s huge cities. It is also a popular crop among those living in the mountains of southern Yunnan Province.
In big cities such as Beijing, coffee shops seem to be on nearly every major street corner. These shops are not just selling drinks from Starbucks, the world-famous coffee company. Coffee businesses from South Korea, Taiwan, HongKong and Britain are also operating in China.
Tea-drinking is steeped in the culture and traditions of many countries, like China and Japan. But is that changing? Are young people from Asia now choosing a cup of coffee instead of tea?
BeiBei Su is from China. She has been living in the United States for the past eight years. Before that, she lived in Italy for two years. Ms. Su says she likes tea better than coffee. But she adds that may not be true among the young generation in China. Many young Chinese people drink coffee socially ---when meeting with friends. Yang Lin lives in the U.S. but comes from an area in China famous for growing tea. She used to only drink tea while in China. But now, she says, she drinks both and for different reasons.
Yang Lin says that drinking coffee for her is a social event. She and her co-workers like to sit in a cafe and talk over a cup of coffee. Voyo is another Chinese woman who now lives in Washington, D.C. She says that after moving to the U.S. her tastes changed. We would call her a coffee convert, someone who now chooses to drink coffee.
With more people drinking coffee, many see an economic(经济的）opportunity for Chinese-grown beans. China-grown coffee could be a money-maker even if most of the coffee on sale in China is imported(进口的).
1. What does the author mainly introduce?| A．Chinese people have long tradition of tea-drinking. |
| B．More and more Chinese are choosing coffee to drink. |
| C．People in big cities like drinking coffee better than tea. |
| D．More Asian people are turning to different drinks. |
| A．A person who has changed to drink coffee. |
| B．A person who has changed to drink tea. |
| C．A person who has changed to grow tea. |
| D．A person who has changed to grow coffee. |
| A．Because she lives in the U.S. Now. |
| B．Because she can talk with friends. |
| C．Because she has drunk tea so long. |
| D．Because her tastes has changed. |
| A．less and less coffee will be imported in China in the future. |
| B．the China-grown coffee beans will be sold to the world soon. |
| C．the need of coffee will offer more chances to make money. |
| D．Chinese economy will depend on coffee beans in the future. |
