【推荐1】The WHO says that 80% of the world’s teens don’t get enough exercise to live healthy lives. The report was based on research done with students aged 11 to 17 in 146 different countries.     1     It’s a pity that not much has changed since then, as the WHO reports.

Doctors say 60 minutes of exercise daily is needed for teens to build up their bone and muscle strength. It’s also hugely important for the health of the heart and lungs.     2     Besides, more and more research is showing that exercise doesn’t just help the body, but also the brain, improving thinking, test scores, and school grades.

    3     They were also very different between boys and girls. In the US, for example, 64% of boys were not active enough, compared to 80% of girls. South Korea was the country with the lowest activity levels — 91% of the boys and 97% of the girls didn’t get enough exercise.

One big reason for the lack of activity in today’s teens is technology, such as smartphones, computers and TVs. Many teens find it hard to pull themselves away from them.     4    

So the WHO warns that teens need to do less playing in the digital world, and more playing in the real world. Teens should take part in sports, whether on official teams or just playing around on the playground.     5     For many people, walking or biking to school is one way to make that happen. It’s very important for young people to build these habits now, because the positive effects of those habits can carry through into adult life.

A．Exercise benefits you academically.

B．Activity levels vary from country to country.

C．The WHO has spared no effort in the research.

D．Such inactivity can severely affect their growth.

E．Exercise can also be built into a normal day’s activities.

F．Regular activity can help them control their weight, too.

G．The WHO has been studying teen activity levels since 2001.

【推荐3】You’ve probably tried easy center-city Beijing rides if you enjoy riding. Now it’s time to level up your rides so they will take you out into the countryside and attractive mountains.

Death Valley
Approximate distance: 100 km loop (环线)

It may sound terrifying, but Beijing’s cyclists named this northern route “Death Valley” on account of the huge tomb it passes, not the number of on-road accidents it has seen. In reality, it’s the closest, mostly car-free loop to the city center and great for really stretching your legs.

Tuesdays/Thursday TTT
Approximate distance: 54 km loop

While it’s not particularly scenic, there are few traffic lights, and the roads are not too busy and have adequate bike lanes on each side, making it a relatively trouble-free ride. If you’d like to ride with a group, seek out early morning Beijing rider groups and join them on Tuesday and Thursday mornings at 5 a. m. or 6 a. m. depending on the season.

The Verse
Approximate distance: 120 km loop

It passes a cafe with good (although expensive) food, and even high-end accommodation, but the best part is their super welcoming attitude towards cyclists. It’s a hike that is well worth the effort, as you are rewarded with amazing views of the Great Wall upon arrival, and a ride back that is mostly downhill.

Tongzhou Grand Canal Forest Park
Approximate distance: 700 km loop

This park is the closest place for riders to enjoy the Grand Canal from Beijing. The Grand Canal is a true wonder in China, and one of the greatest civil engineering projects in history. The oldest parts of it date back to the 5th century BC. It will be a fun ride here.

1. How does the route Death Valley get its name?

A．It offers deadly loops for cars.	B．It is located in an isolated place.
C．It involves passing a large tomb.	D．It witnesses numerous accidents for cyclists.

2. Which of the following covers the shortest distance?

A．Death Valley.	B．Tuesdays/Thursday TTT.
C．The Verse.	D．Tongzhou Grand Canal Forest Park.

3. What features do the last two routes share?

A．A downhill ride.	B．Second-to-none cafes.
C．Adequate bike lanes.	D．A view of historical sites.

【推荐1】William Lindesay has been interested in the Great Wall of China since seeing it in a school atlas(地图册) as a child in England. He can vividly recall seeing in the “Oxford School Atlas” the Great Wall with its battlement symbol. From that moment, he had in his mind that when he grew up he’d go to China and walk along the Great Wall from end to end.

Lindesay’s about 3, 000 km solo run along the Great Wall began in 1987. Running the length of the wall was a brave expedition(探险), venturing(敢于去) into sparsely populated regions where there was little chance of help if the runner had an accident. During another trip, Lindesay and his team ventured deep into the Gobi Desert. The explorers almost died from dehydration(脱水). In total, Lindesay estimated in an interview that he had spent about 1, 600 days of his life on the great Wall in all seasons.

Lindesay and his wife, Wu Qi, whom he got to know and fell in love with during his trips in China, had a farmhouse at the foot of the wall. During his exploration, he noticed some sections of the wall were badly damaged and covered with litter. Modernization and development were making the situation even worse. “Some people say it will take generations to change; I say we don’t have generations of time. It’s got to be much quicker,” he said. Lindesay always carries a garbage bag with him in the wilderness, picking up litter along the way. Lindesay uses a garbage bag as his calling card. The cloth bag bears a set of nine simple guidelines in Chinese, which calls on people to obey while traveling or camping outdoors: “Take your own garbage home”“ Pick up litter left by others”“Don’ t damage plants or flowers, or pick fruit” and lots more.

1. What inspired William Lindesay's dream of exploring the Great Wall?

A．Seeing a movie about the Great Wall.

B．Experiencing a war for the Great Wall.

C．Surfing a website about the Great Wall.

D．Admiring the Great Wall in the school atlas.

2. What does the underlined word “sparsely” mean?

A．Remotely.

B．Rarely.

C．Frequently.

D．Largely.

3. What worsened the situation of the Great wall?

A．The destroyed ecosystems.

B．Waste caused by farms

C．The increasing tourists.

D．Modernization and development.

4. What sort of man is William Lindesay?

A．Adventurous and caring about the environment.

B．Determined and grateful to his wife.

C．Warm-hearted and polite to his teammates.

D．Considerate and optimistic about the life.

【推荐3】Before war and time destroy more of our important cultural sites, we need to save them in 3-D digital libraries. Across 163 different countries, 1,000 natural and cultural historic places make up our most precious human heritage, which UNESCO calls World Heritage Sites.

We lose a little of that heritage every day. War, climate change and pollution have a bad effect, as do wind and rain. The $4 million a year that UNESCO spends on preservation is not nearly enough to take care of even the four dozen sites considered at approaching risk of being lost forever. Now there’s a better choice. New digital-conservation technologies let us hold on to them, at least virtually(虚拟的), through 3-D scanning, modeling and digital storage. Such projects can be accomplished through cooperation between governments, universities, industry and non-profit organizations.

To make a 3-D model, a laser(激光) scanner bounces light off an object and records the results. To reproduce every corner and opening, the scanner collects overlapping(重叠的) images from all possible angles. A computer then sews them together into one large surface image and draws lines from one point to another to create a wire-frame model. High-resolution digital cameras add color and texture. When fully put together, the models can be viewed, printed or operated.

These scans do more than preserve a memory in a database. With highly accurate measurements, archaeologists(考古学家) can find hidden passages or reveal ancient engineering tricks. School kids can explore places they might otherwise never see. And when a site is destroyed, the scans can even be used to reconstruct what was there. That has already happened for one World Heritage Site, the Kasubi Tombs in Uganda. Built of wood in 1882, they were destroyed by fire in 2010 and rebuilt in 2014, based in large part on 3-D models made in 2009. More than 100 World Heritage Sites have been already preserved as 3-D models, and conservationists are racing to record as many more as possible.

1. How does the author show the necessity for 3-D digital libraries in the first two paragraphs?

A．By listing the threats to our human heritage.

B．By introducing some damaged historical sites.

C．By quoting some experts’ views on heritage protection.

D．By explaining UNESCO’s research on World Heritage Sites.

2. What is Paragraph 3 mainly about?

A．The function of a laser scanner.	B．The reflection of light off an object.
C．The process of making a 3-D model.	D．The development of 3-D digital technology.

3. What do we know about the Kasubi Tombs in Uganda?

A．It is metal-framed.	B．It is still in its original condition.
C．It was once destroyed in an earthquake.	D．It was reconstructed thanks to 3-D models.

4. What does the author intend to say through this text?

A．Never ignore the destructive power of war.

B．Take action to reduce pollution in historic places.

C．Take advantage of 3-D technology to keep history.

D．Invest more money to preserve World Heritage Sites.

【推荐1】Mario Cohn-Haft remembers the sinking feeling he had when he realised the parrot he had come to see would probably not appear before him again. He had taken a bird-watching tour to the area where the very last wild Spix’s macaw(金刚鹦鹉), a blue parrot native to Brazil, was known to show itself. But that tour was the first he had led that couldn’t spot it. “I was one of the first people to experience it being extinct in the wild,” says Cohn-Haft, an ornithologist (鸟类学家). That was 20 years ago. No wild Spix’s macaws have been seen since.

But today there is hope. Spix’s macaws still exist. A small number of breeding pairs are currently living in captivity ( 圈 养 ). Conservationists are in the middle of a project to raise healthy birds and prepare them for release into the wild. The Association for the Conservation of Threatened Parrots (ACTP) is leading current efforts.

Cromwell Purchase, a director at the ACTP, explains that the group plans to send 50 Spix’s macaws to rehabilitation facilities in Brazil, which are currently under construction. If all goes well, the birds will be shipped from Germany soon. The conservation team will first practice a technique for releasing the birds on a small flock of Illiger’s macaws. Then, in 2021, the Spix’s will be released with a small group of the Illiger’s, which will hopefully help them to adapt to the forest of Caatinga.

The real test will be whether the birds take to their native surroundings and whether they successfully breed and raise chicks in the wild. But Brazil wants the plan to work. “We know how to reintroduce parrots. There are now many publications and case studies that show we can get birds out into the wild and have them survive,” says Don Brightsmith, an expert in parrots. Brightsmith notes one important point — the birds must be shown how to raise chicks independently. Otherwise, any reintroduced population will quickly collapse.

Happily, Purchase says this is something he and his colleagues are working on. Should the birds flourish, the blue flash of a Spix’s wings might one day be seen again by locals and, perhaps, fascinated groups of bird-watchers.

1. What do we know about Cohn-Haft’s bird-watching tour 20 years ago?

A．It turned out to be fruitless.

B．It was his last bird-watching tour.

C．It inspired him to study the Spix’s macaw.

D．It allowed him to spot the last wild Spix’s macaw.

2. Which of the following is most likely to take place in 2021?

A．Some Spix’s macaws being sent to their natural habitat.

B．Some Spix’s macaws and Illiger’s macaws being crossbred.

C．Some new Spix’s macaw rehabilitation facilities being built.

D．Some breeding Spix’s macaws being imported from Germany.

3. Which word can best describe Brightsmith’s tone of speech?

A．Cautious.

B．Confused.

C．Confident.

D．Concerned.

4. What does the underlined word “this” in the last paragraph refer to?

A．Case-studying wild Spix’s macaws.

B．Enabling Spix’s macaws to fly again.

C．Increasing the population of Spix’s macaws.

D．Training adult Spix’s macaws to be qualified parents.

【推荐2】Yellow fever began to spread in Brazil in 2016, severely threatening the golden lion tamarin, a little monkey living in the rainforest of southeastern Brazil, whose population was small even before the outbreak. So, scientists created a vaccine (疫苗) to protect the monkeys. But, it is a new idea to vaccinate animals. Historically, conservationists have believed that humans should not interfere directly with wildlife. A traditional saying in the world of conservation work is “Leave it as is.”

However, Tony Goldberg, a scientist and animal doctor at the University of Wisconsin-Madison, believes in vaccinating wild animals when possible. “Some people say we shouldn’t touch nature. But really, there are no unspoiled natural habitats left.” he said . “This epidemic moved very quickly from north to south, across the country — no wildlife does that. It’s people. They cross vast distances in buses, trains, planes. They bring the disease with them. We realized that in five years, we could lose the entire population if we did nothing.”

The vaccine led to antibodies in the tested monkeys and caused no harm, the scientists found. So far, about 300 have been vaccinated and are reported to be doing well. Tests show that more than 90 percent of the monkeys have immunity or resistance to the virus since vaccination.

The outbreak of yellow fever is no longer a big problem for the monkeys, and their population is starting to come back. But even with the success of the vaccine program, scientists are still not sure about creating vaccines for other animals. Jacob Negrey, a biologist who studies monkeys, wondered about unpredictable effects of such wildlife treatment. He explained that you might create a treatment that helps one kind of animal but hurts another.

1. What caused monkeys to get infected with yellow fever?

A．Human activities.

B．Loss of their habitat.

C．Convenient transportation.

D．The development of Science and technology.

2. What happened to vaccinated monkeys?

A．They are resistant to all viruses.

B．They are no longer endangered animals.

C．There is an increase in their population.

D．Some of them are harmed by the vaccine.

3. What’s Jacob’s attitude to creating vaccine for other animals?

A．Indifferent.

B．Optimistic.

C．Doubtful.

D．Neutral.

4. What’s the best title of this passage?

A．Vaccinating animals: a heated debate	B．Yellow fever: a threat to monkeys
C．Protecting monkeys: a top priority	D．Vaccine: a blessing for monkeys