选择知识点

China's famed wandering elephants are on the move again.The group left a wildlife reserve in the southwest of Yunnan province more than a year ago and has traveled 500 kilometers north to the outskirts of the provincial capital of Kunming.The direction of their travel could be a good sign,since authorities are hoping to lead them back to their original home in the Xishuangbanna Dai Autonomous Prefecture southwest of Kunming.
Authorities have been attempting to keep a distance between them and local residents,while blocking roads into villages and seeking to trick them away with food drops.Despite that,the herd of 15 have attacked farms,strolled down urban streets and searched for snacks in villages and even a retirement home.
All of the animals are reported to be safe and sound and no person has been injured in conflict with them.Officials have issued strict orders to seek to drive them off using firecrackers or other means.China's roughly 300 wild elephants enjoyed the highest level of protected status, on a par with the country's unofficial mascot（吉祥物），the panda bear.Additional emergency workers,vehicles and drones have been arranged to monitor the elephants' movements and protect local resident.Some 2.5 tons of food were laid out for the animals.
It remains unclear why the elephants began such a long journey,although Evan Sun,wildlife campaign manager with World Animal Protection,said possible reasons could include the lack of food supply,a rise in the elephant population and,most importantly,loss of habitat. "The increase of human-elephant conflicts reflects the urgency for a more strategic policy and plan to protect these endangered wild animals and their natural habitats," Sun wrote in an email.
This also creates a great opportunity to educate the public about the challenges that wild animals face for survival and the need for better protection from a government,industry and society level.We need to adopt a variety of creative measures to help both creatures coexist,not just keep a distance from them.



Which can best replace the underlined words "on a par with" in paragraph 3？ ______

A. Equal to.
B. Familiar with.
C. Ready for.
D. Proud of.

What does Evan Sun respond to this phenomenon？ ______

A. Sympathetic.
B. Positive.
C. Concerned.
D. Cautious.

What can we expect of the elephants in the future？ ______

A. They will be focused on more and protected better.
B. They will become a hot issue to educate the public.
C. They must keep a safe distance from humans.
D. They could get all-around attention from the government.

Where can you read the text？ ______

A. In a geography book.
B. In a book review.
C. In a science fiction.
D. On the Internet.

Recycling plastic has always been a stop-start effort,and the wide variety of plastics we produce,the pollution from waste,and other limitations make recycling an economic（经济）problem.It's estimated（估计）only 9% of plastic ever created has been recycled.But with the help of a chemical process,Canadian Miranda Wang and her company BioCellection want to change that.
Stability is one of plastic greatest qualities and downside.There's limited evidence that some plastics can biodegrade（生物降解）but largely photo-plastics degrade in the sun.It's a long process,and the truth is that we can only estimate how long it takes.Wang is looking to break the inaction and BioCellection's task is to make most plastic waste recyclable.
She outlines two current methods.One is to take plastics like water bottles,wash them,cut them,melt and reconstitute them. "That's a very limited process." she says,due to the requirement that plastics be "clean".The other,which can handle dirtier plastics and a level of pollution,is called hydrolysis（热解）.Intense heat is applied to break down plastics so they can be reused as oils for energy,but "it's not economical," she says.
BioCellection's solution builds on research from over ten years ago,Wang explains,when a US study discovered pure polyethylene powder（聚乙烯粉）could be broken down by a catalyst（催化剂）.Wang and her co-founder Jean hit upon a bacterium being able to eat plastic.In the years since,they engineered a comparable catalyst capable of doing the same job,only faster,which even works on plastics no one else can recycle at present. "We have now found a catalyst that is much cheaper than the one that was used before," Wang says.
Currently focusing on plastic films like shopping bags,the three-hour process breaks down plastic into chemicals that can act as the building blocks for more complex plastic products.
"Right now we're able to achieve about 70% transformation from plastic waste material to these chemicals," she adds,saying they're working to increase that figure.



Why has so little plastic been recycled？ ______

A. Plastic is chemically stable.
B. Recycling plastic led to pollution.
C. We produced various plastics.
D. Most photo-plastics degrade in the sun.

What does Wang think of the two current methods？ ______

A. Highly effective and dynamic.
B. Expensive and pollution-causing.
C. Limited and energy-consuming.
D. Widely used and recognized.

What did BioCellection find effective to recycle plastics？ ______

A. Polyethylene powder.
B. Chemical products.
C. Plastic films.
D. A catalyst.

What is the text mainly about？ ______

A. Miranda Wang and her company.
B. A new plastic recycling method.
C. The greatest downside of plastic.
D. Transformation of plastic waste.

For centuries,tea has been used for far more than overcoming thirst.Around the world people drink it to relax and restore energy.
Green,oolong and black tea come from the same plant — Camellia sinensis（茶树）.Green tea,however,is processed in a different way,which results in higher levels of some of the compounds that scientists believe have positive effects on our mental health.
A 2017 review of more than 100 studies found that green tea can impact the brain in three ways：reduce anxiety；focus attention；and improve brain function,especially memory.However,it was cautioned that the effects aren't large,and current evidence is mainly provided by small-scale studies.
There are also suggestions that tea could improve the symptoms of depression,dementia（痴呆）and Down syndrome （唐氏综合征）.
A 2018 study conducted in South Korea found that frequent green tea drinkers were 21% less likely to develop depression than those who were non-drinkers.However,as an observational study,it couldn't establish cause and effect,only association.
Tea also has some benefits for our physical health — it's linked to a longer life,could reduce some risk factors for cardiovascular（心血管的） disease such as heart attack and stroke,and may also have a weight-losing effect.
"We need better data to truly assess the benefits of tea on our mental and physical well-being," said Gunter Kuhnle at the University of Reading,"however,with the exception of green tea pills,which have been linked to liver damage,and burning tea,which has been linked to esophageal（食道的）cancer,there's no real downside to a cup of tea.I think most people enjoy rituals（仪式感）.It's a comforting thing.If there's anything wrong,here it's a cup of tea that's needed."



How is green tea different from oolong and black tea？ ______

A. It cures depression and dementia.
B. It is never part of a complex ritual.
C. It has higher levels of certain compounds.
D. It is taken from Camellia sinensis.

What does Gunter Kuhnle want to express？ ______

A. Green tea rituals give people comfort.
B. Green tea pills may cause esophageal cancer.
C. Green tea brings people more harm than good.
D. Green tea proves beneficial with no exception.

Which can be a suitable title for the text？ ______

A. Which tea prevents cancer
B. Why drinking tea might help
C. When tea causes liver damage
D. How teas are processed

Any family who has traveled to Disney World in the middle of summer has experienced the challenges of this vacation.The summer crowds and burning heat can make it a frustrating place for many people.Families with autistic （患自闭症的）children face even greater problems.
Parents Bill and Lauren Bergner were excited to bring their 6-year-old son Gary to Disney World,along with his brothers Billy,14，and Jake,9.Gary has autism,so Mom and Dad took the time to talk with him and prepare him for the chaos（混乱）that came from such a busy vacation.
After a particularly long day,Mom could tell Gary had reached his limit. "My son was having an autism（崩溃），" Lauren posted on Facebook. "He was crying and just having a hard time. " Gary's reaction could have easily been a sad end to a tiring day.
But,it's Disney World and we all know about the happy endings that can happen there!As Gary cried and stood in line waiting to see Snow White,the Disney princess stepped up and seemed to have a magic touch with the little boy.
"Snow White was amazing with him!!" Lauren wrote in her Facebook post. "She kissed and held him in her arms.She then took him away from the crowd!She held his hand,danced with him,took him over to a bench and sat with him.She went above and beyond! "
The family had never seen Gary connect with a stranger so quickly,but they were worried their son was taking up too much of Snow White's time and other guests would be upset.In fact,onlookers（旁观者）were all happy to witness （见证）the magical moments between the two.
In the Facebook post,the Bergner family say they hope Snow White is recognized and thanked for the difference she made in their family's experience and Gary's life. "I'm thankful someone took photos and these moments were recorded," Lauren wrote. "My heart is full."



What does the underlined word "frustrating" in paragraph 1 most probably mean？ ______

A. Exciting.
B. Magical.
C. Inconvenient.
D. Pleasant.

What might Mom and Dad talk to Gary about before their vacation？ ______

A. What kind of situation he would face.
B. Whether they would avoid the chaos.
C. Why they were going to Disney World.
D. When he would see Snow White.

Why did Gary cry while standing in line？ ______

A. He couldn't see Snow White among the crowds.
B. He felt too tired to go on with the vacation.
C. He had waited so long to see Snow White.
D. He couldn't manage the stress anymore.

What did Gary's parents want to convey in the post？ ______

A. Their praise to the people who took photos.
B. Their satisfaction to Gary's reaction to the stranger.
C. Their concern about Gary's life in the future.
D. Their gratitude to Snow White's act of kindness.

At the end of a race,you'll often see runners reaching for bananas.Although people who only exercise at weekends might be more likely to reach for a sports drink,serious athletes know there are better choices.And a new study from Appalachian State University offers proof that bananas may be a better choice than sports drinks after exercise.
Researchers analyzed the blood of 20 competitive cyclists after they were given water and bananas,water only,or a 6 percent sugar drink（a sports drink）every 15 minutes during a 47-mile bike ride.The study found that the carbohydrates（碳水化合物） in bananas work as well as sports drinks to fuel athletes and help them recover.But the researchers found an additional benefit.Bananas also provide greater anti-inflammatory benefits than sports drinks.
"Consuming bananas with water during exercise has several advantages for athletes above those linked to regular sports drinks,"Dr David Nieman said in a statement. "Banana metabolites（代谢物）that increase in the blood have a similar effect to aspirin that inhibits（抑制）COX-2 activity.This makes bananas close to the perfect athletic food. "
"Although aspirin and other anti-inflammatory drugs（AIDs）help athletes with post exercise pain,they are often discouraged because they can cause cell damage," Nieman tells Men's Health. "For this reason,we tell athletes not to take them," he says. "To our pleasant surprise,we found something natural in bananas is working like these painkillers but without the risks. "
Sports drinks are still a choice,but Nieman and his team believe bananas offer more.
"There's no question that sports drinks work," he explains. "But bananas also have other nutrients - vitamin C，B6 and these unique metabolites - that you don't get with a sports drink. " Next up,the research team is looking at other fruits as exercise companions. "We're starting to look at blueberries,because we think with bananas they might work even better," Nieman says.



What is the aim of the study described in Paragraph 2？ ______

A. To test for the effects of bananas.
B. To find out the best way to recover.
C. To prove sports drinks are useless.
D. To find out if sports drink are anti-inflammatory.

Why are bananas regarded to be the perfect athletic food？ ______

A. Because bananas are full of nutrients.
B. Because bananas can be easily digested.
C. Because bananas can be of some medical value.
D. Because bananas are similar to regular sports drinks.

What is Paragraph 4 mainly about？ ______

A. Why bananas are better than AIDs.
B. How bananas can help ease pains.
C. What can be caused by eating bananas.
D. Whether we should replace AIDs with bananas.

What might Dr.David Nieman agree with？ ______

A. People shouldn't replace sports drinks with fruits.
B. Bananas offer more to sportsmen than sports drinks.
C. Blueberries are better for sportsmen than sports drinks.
D. People shouldn't eat or drink too much when exercising.

Chinese audiences on average spent more time watching entertainment content online in this uncommon year when the battle against COVID-19 is still being fought.
An average consumer has spent 133.9 minutes each day watching TV dramas, a 10 percent increase compared to last year, according to the report. Interestingly, TV romantic dramas make up 36 percent of all 131 new television series this year, ranking the first.
In the overseas market, Chinese dramas are seeing a rise in popularity, such as hit costume dramas Three Lives Three Worlds, The Pillow Book, and The Romance of Tiger and Rose. The report shows that subscribers（订阅者）of WeTV， the overseas version of Tencent Video in more than 110 countries and regions, have risen 175 percent over last year, with time spent watching these programs up 300 percent year-on-year.
Shows with strong female roles are more popular, like the hit series Nothing but Thirty,I Will Find You a Better Home and A Murderous Affair in Horizon Tower,the report said. It also found that a quality trailer（预告片）played an important role in drawing an audience,as about 90 percent of consumers pick their choices from trailers.
As a result of the six-month shutting down of Chinese cinemas, a number of people have chosen watching films online.
Through Nov. 30， a total of 15 online films have earned more than 10 million yuan, propelling the annual box office income on Tencent Video to nearly 500 million yuan this year. While TV series are almost "dominated" by female audiences, men are favored online movies more. Nearly 70 percent of online film viewers are men, whose favorite themes center on fantasy, comedy and adventure.



The shows with strong female roles are mentioned except ______ .

A. Nothing but Thirty.
B. I Will Find Your a Better Home.
C. The Romance of Tiger and Rose.
D. A Murderous Affair in Horizon Tower.

The underlined word "propelling" in the last paragraph probably means ______ .

A. protecting
B. pushing
C. stopping
D. beating

Which of the following is NOT true according to the passage？ ______

A. Chinese audiences spent more time online due to the COVID-19
B. Chinese dramas have made success in the overseas market
C. A quality trailer plays an important role in consumers' choices
D. Compared with males, females have a more preference for online film

Drinking your daily cup of coffee may help to lower your risk of stroke（中风）and heart disease,according to a latest research.Researchers at the Heart and Vascular Centre,Budapest,Hungary have found that drinking up to three cups of coffee a day may help protect your cardiovascular（心血管的）system.
The team studied data from nearly 500，000 people registered in the UK Biobank with an average age of 56 and no signs of heart disease at the time of recruitment.They divided them into three categories according to their coffee drinking habits：non-drinkers,up to three-cup-a-day drinkers,and more than three-cup-a-day drinkers.
Considering influencing factors such as age,sex,weight height,physical activity,blood pressure,diabetes,socioeconomic status,and usual intake of alcohol,meat,tea,fruit and vegetables,they found that three-cup-a-day drinkers had a 12 per cent lower risk of death from all causes,a 17 per cent lower risk of death from cardiovascular disease,and a 21 per cent lower risk of stroke
"To our knowledge,this is the largest study to systematically assess the cardiovascular effects of regular coffee consumption in a population without diagnosed heart disease," said study author Dr Judit Simon.
To further investigate the effect,the researchers used data from more than 30，000 participants in the UK Biobank who had undergone MRI（核磁共振成像）scans to determine the structure and functioning capacity of their hearts.
Dr Judit Simon said, "The imaging analysis indicated that compared with participants who did not drink coffee regularly,daily coffee consumers had healthier sized and better functioning hearts.Our findings suggest that coffee consumption of up to three cups per day is associated with favourable cardiovascular outcomes.While further studies are needed to explain the underlying mechanisms,the observed benefits might be partly explained by positive changes in cardiac structure and function. "



What is the latest research mainly about？ ______

A. The risk of heart disease.
B. The ways to avoid stroke.
C. The cups of drinking coffee.
D. The benefits of drinking coffee.

Why does the author mention the influencing factors in paragraph 3？ ______

A. To show the difficulty of the research.
B. To show the reliability of the findings.
C. To introduce the process of the research.
D. To introduce the limitation of the findings.

What do the two data analyses have in common？ ______

A. They find coffee's positive effects on people.
B. They focus on negative changes in people's hearts.
C. They oppose coffee consumption.
D. They have been accepted widely.

What attitude does Dr Judit Simon have to drinking coffee？ ______

A. Carefree.
B. Skeptical.
C. Favourable.
D. Tolerant.

A project in Kenya is using biogas（沼气）technology to attack two major pollution problems with one device：a machine that changes waste such as invasive water hyacinth（入侵性水葫芦）into cleaner cooking fuel.
The project from Biogas International,a Kenyan energy technology company,has so far provided 50 of the Flexi Biogas devices to homes in the city of Kisumu in western Kenya.The main device is called a digester（浸煮器）because it breaks down plant waste to produce gas.The digesters will permit families to stop using wood or coal,both of which produce dangerous smoke.People will also be able to cook foods faster using the gas.Tony Otieno used the gas from a digester to cook tea for his 70-year-old grandmother Margaret.He said, "The gas has no smoke,does not smell,and it is much faster than the jiko（a stove that uses wood-coal）."
Some of the families received a gas stove as part of the project,to replace their jiko.The machines process plant waste such as water hyacinth.That plan has covered large parts of Lake Victoria.The weed-like plant harms living things in the lake including fish.The plant also helps bacteria and mosquitoes increase,causing health risks to local communities.
Dominic Wanjihia Kahumbu is head of Biogas International.He said that at a cost of ＄650，most families in the city do not have enough money to buy the device.Although the technology can be on a small or large scale,he said,each system costs a lot to make.As a result,it is unlikely that the company will make a profit for at least another five years.He said the company needs new investment.
Two larger versions of the equipment are still in the testing stage.They would produce clean fuel on an larger scale for restaurants,chicken farms and fish drying facilities in the area.



What do the two major pollution problems refer to？ ______

A. Bacteria and mosquitoes.
B. Plant waste and fuel pollution.
C. Biogas and water hyacinth.
D. Jiko and dangerous smoke.

Which of the following can best describe the device？ ______

A. Large.
B. Cheap.
C. Environment-friendly.
D. Nice-looking.

What can we know about the water hyacinth from the text？ ______

A. It helps fish increase.
B. It has covered Kenya.
C. It's a threat to the local people.
D. It leads to the invention of digester.

What does paragraph 4 mainly tell us about the device？ ______

A. Its kinds.
B. Its disadvantages.
C. Its future.
D. Its function.

Standing on the edge of the plane,my tandem skydiving（双人跳伞）instructor,Bill,asked "Do you have any last words？" "Yes," I said,joking. "I hope my parachute opens."
I'd never felt more alive as Bill and I stepped out and started our freefall.Those first few seconds were amazing.As we reached 4，000 feet,I felt a parachute open above us.This,I was told,would slow us down for a smooth descent（下降）.So why were we still traveling so fast？I looked up：The parachute was flopping unopened in the wind.I started to freak out.I could hear Bill swearing as he tried to fix whatever had gone wrong.Seconds passed,which felt like forever,until finally our emergency parachute opened.Except it got caught in the first one,making both parachutes useless.I asked Bill,"Are we going to die？" He said he didn't know.At that moment,I just felt guilty.I'd brought my family along for the day.I'd invited them along to watch me die.
We hit the ground.I was immediately breathless,and an unimaginable pain shot up my back as we bounced into a lake on a golf course（高尔夫球场）.Gathering all my strength,I turned to face Bill.He started screaming.We were found by some golfers.My mother and sister cried uncontrollably as Bill was put into a helicopter,and I was placed into an ambulance.The next four or five months were intense.I had broken my back.After being discharged（出院）from the hospital,I locked myself in my bedroom and took painkillers.I became terrified of the outside world.
After years of therapy（治疗）and hard work,the deep physical and mental pain is healing.I heard that Bill made a full recovery and returned to skydiving.I was always terrified of being myself and doing the things I wanted.Now I've learned that I need to be fearless.There's nothing like falling from 15，000 feet without a parachute and surviving to force you to make the most of every day.



How did the author feel before skydiving？ ______

A. Worried.
B. Excited.
C. Terrified.
D. Guilty.

What happened during the tandem skydiving？ ______

A. Bill didn't open the parachute in time.
B. The author stayed calm the whole time.
C. Something went wrong with the parachutes.
D. The author couldn't breathe during the freefall.

How did the accident influence the author？ ______

A. He had constant pain in his head.
B. He became crazy about extreme sports.
C. He developed a serious mental problem.
D. He became more confident in himself.

What did the author eventually realize？ ______

A. Safety first.
B. Fear can lead to failure.
C. Cooperation matters.
D. Seize and cherish every day.

A group of scientists in labs spread across Europe,the U.S.and Nepal have been working on Qomolangma "remotely".The project's goal is to turn the world's highest mountain into a huge climate laboratory.
During April and May last year,a team of more than 30 biologists,glaciologists,geologists,meteorologists,and geographers fanned out across Qomolangma's southern side,conducting fieldwork high on the mountain. "We believe the best way to get a full scientific picture of Qomolangma is not just to do one kind of science," says Paul Mayewski of the University of Maine,the leader of the effort.
Each individual study promises a unique picture of the mountain's climate—past,present,and future.Ice cores will allow scientists to go back in time—tens,hundreds and perhaps thousands of years to learn about the environment.Snow and water samples give a look at what's happening on the mountain,today,including the future of the glaciers.The team also fixed a network of automated weather stations,which will document upcoming weather trends for years to come.
One of the hardest tasks fell to Mayewski's colleague Mariusz Potoeki,who hoped to drill ice cores at several places on the mountain,including the South Col（25，938 feet） and the top of Qomolangma（29，035 feet）.The job required a specially designed drill system powered by batteries,and an excellent team to figure out how to prevent the cores from becoming liquid during their long journey back to the University of Maine's laboratory for analysis.
Potocki abandoned his summit attempt due to the crowds of normal climbers.To his relief,Potocki succeeded in taking the highest ice core ever recovered,at just above Camp Four—26，312 feet above sea level. "The ice doesn't lie." Mayewski says. "The very idea that the highest part of the planet hasn't been spared from human activity ought to be a real wake-up call for everybody."



Which way does Paul Mayewski suggest to fully study Qomolangma？ ______

A. Working on it remotely in labs.
B. Teaming up with more countries.
C. Doing many kinds of science.
D. Turning it into a real lab.

Why does the team analyze ice cores？ ______

A. To document upcoming weather change.
B. To get a unique picture of climate trends.
C. To know more about the past environment.
D. To predict the future of the mountain.

What difficulty did Mariusz Potocki face？ ______

A. Improving the special drill system.
B. Drilling the oldest ice cores at some places.
C. Conducting fieldwork above Camp Four.
D. Delivering frozen ice cores to the lab.

What can we infer from the last paragraph？ ______

A. Potocki got ice cores at 29，035 feet.
B. Human activity has affected Qomolangma.
C. Ice cores can serve as a warning for us.
D. Normal climbers helped with Potocki's work.