For those looking to escape the concrete jungle, maybe it’s time to dive into the bamboo forests of southern Sichuan.

A natural forest that people in Sichuan province tend     1    (visit) is the Southern Sichuan Bamboo Sea in Yibin. The 120-square-kilometer Bamboo Sea is the     2     (large) bamboo park in China and its average temperature seldom drops below zero degrees Celsius in winter     3     many parts of the country are covered with snow and ice.

Known as one of the country’s 10 most beautiful forests, it     4    (be) a popular tourist attraction since the Oscar-winning Crouching Tiger Hidden Dragon     5    (shoot), there in 2001.

Two years later, the bamboo forest received world-wide     6    (recognize) as a bamboo reserve in December 2003,     7    (become) the fourth tourism destination in China to be granted Green Globe 21 certification.

The Bamboo Sea covers Changning and Jiang’an, two counties     8     the authority of Yibin. Amazed at its vast expanse, Huang Tingjian,     9     poet from the Song Dynasty, described it as “bamboo waves”. As Huang was an     10    (influence) man of letters, his description gave rise to the forest’s popular nickname—the Bamboo Sea.

3 . I stared out the window,_______ the snow. Damn holidays. . . I thought as I saw the people outside caroling(唱颂歌)outside. Can’t I just be left alone!I got up from my bed and, in _______, made for the kitchen.

I made myself dinner, which wasn’t anything_______. I wasn’t the best cook so I just made myself a stir fry and_______ it a day... That was until I heard the noise. Did someone throw ice at my window? Maybe a thief? I _______ the katana(武士刀)and walked down stairs. I searched the entire house until I found a puppy, so cute and_______. I couldn’t help but _______ at this creature. I decided to keep it and named it Arthur. His eyes were blue like a husky dog. Maybe a mixed breed? I thought as I washed Arthur up and dried him with a_______. Then I spent all night_________with my new friend. It was the first ________of joy I felt during the holidays in years. For the next week, Arthur and I spent the holidays watching romance movies on Netflix, sleeping, or ________ our mouths with the food in the house. It was probably the happiest I’ve been in months. Arthur really made an impact on my life that I never thought was ________.

Arthur stayed by my side a majority of the time. My friend called him ‘mama’s boy’ or something silly like that. I didn’t________ it, though. Every year on Christmas day, I thanked God for giving me the ________. And I ________ felt blessed with My Arthur. My little boy.

4 . In late spring and early summer each year, tens of millions of butterflies come out of their chrysalises (蚕蛹) in the butterfly valley in southwest China’s Yunnan province. For butterfly expert Yang Zhenwen, it is the busiest time of the year, but he greets it with great enthusiasm.

Before the break of dawn, Yang has already arrived at the observation point, busily tending to the needs of the awakening butterflies. “Due to warmer temperatures, the ‘butterfly explosion’ this year occurred slightly earlier than usual, and the size of the butterflies is larger than that in previous years,” said 46-year-old Yang, curator (馆长) of the butterfly valley museum. “We expect that there will be about 80 million to 100 million butterflies in the valley during this year’s ‘butterfly explosion’. That seems so crazy,” said Yang. According to Yang, in the valley, more than 320 butterfly species have been identified in specimens or photographs, including the rarest, most primitive, largest and smallest butterflies in China.

Besides Yang, many local villages have also assumed the role of butterfly guardians. However, the journey toward achieving human-butterfly harmony was far from easy. Some two decades ago, the villagers had little awareness of butterfly protection, believing wrongly that butterflies could endanger their food crops. They viewed them as pests that should be removed.

In 1998, Yang began his journey at the agricultural science station in Ma’an’di Township, the very place where the butterfly valley lies. “It was there that I got into a frequent dilemma— the local villagers, seeking to protect their crops, would often turn to pesticides to kill the butterflies,” he said. “However, my sincere love for these creatures forced me to prevent them from harming the delicate insects.”

Now, the development of ecotourism relying on butterfly resources has successfully changed the once extremely poor township. More villagers have started reproducing butterflies. He describes the butterfly valley as a “dream-making machine”, which extends the “butterfly dream” of harmonious coexistence between humans and nature.

5 . Emmanuel Mendoza, a college student, is currently running a study at Texas A&M University, where he’s mixing simulated (模拟的)Martian (火星的) soil and frass(粪便)from fly larvae(幼虫)to find just the right recipe for growing plants on Mars.

The seed of this idea was planted when Mendoza was in middle school, watching Ridley Scott’s 2015 film The Martian, in which Mark Watney becomes stuck on the planet and grows potatoes to survive. “That got me really interested in what nutrients or what soil structure Martian soil has that we could potentially take advantage of, ”Mendoza said.

Now, he’s running an experiment growing English peas in simulated Martian soil. “I definitely considered potatoes like Mark Watney, ”he said. “But the fact was that I couldn’t necessarily get the data I wanted out of them. ”

He wanted to be able to measure plant growth as it occurred throughout his experiment. Since potatoes grow underground, he’d only be able to collect data once they were done growing. In the end, Mendoza chose to grow English peas because they’re self-pollinating(自花传粉), grow fairly quickly and he can see the shoots climb.

Martian soil, though it does contain other essential nutrients, isn’t exactly ideal for plants from Earth. It tends to be rocky and lacks the right organic (有机 的)matter. Here’s where the larvae come in. Mendoza turned to the larvae of black soldier flies, which produce a waste known as frass. “They can break down almost any biomatter and turn it into really useful matter, “Mendoza said. “And then you can use the frass as a nutrient alternative to soil.”

For this experiment, Mendoza mixed different percentages of simulated Martian soil and frass to see what best supported growing English pea plants. Now, he said he’s seeing growth across all his plants—even the ones growing in 100%simulated Martian soil.

6 . My parents have a boxer dog called Boris which is as badly behaved as his name might suggest. He is known to ________ on a chair at the kitchen table expecting full ________. Whenever the dishwasher is being stacked, he likes to add a personal prewash to the ________.

Even my mother might ________ that Boris is the worst-behaved dog she has ever had, but on the plus side, he is very ________.

The sofas and chairs in their sitting room are covered in books-not because my parents love to read, but in an attempt to ________ the dog climbing on the furniture. ________, any human who wants to sit on a sofa has to ________ a library of books. I’ve suggested a removable cover would be more attractive, or training, but it’s too late for that.

The story between my parents and Boris is repeated across our community. Usually, our gang of dogs gathered almost daily, ________ did we. A group of folks of different ages, backgrounds and interests—all ________ by our dogs. Friends are therefore made through dogs, creating a ________ that lasts far beyond the lifespan of our canine(犬的)family. Sunny, Jess and Archie have all ________ now, but the friendship between us humans remains.

I have met so many people whose daily ________ with their group of dog have been their mainstay and helped them deal with ________. They are medicine for the_________. Dogs are actually man’s best friends.

7 . There are a lot of chemicals that can cause indoor air pollution. A recent project conducted has found over 900 different substances in our home are related to it. Many researchers have already examined the causes of indoor air pollution.     1    

It has been proved that different kinds of chemicals can be released by building materials and new furniture. Everything from painting and decorating products, bathroom cleaners and beauty products can contain these chemicals.     2     For instance, cooking generates a lot of harmful emissions, like frying meat in oil.

As a research from Denmark has highlighted, cooking, particularly roasting can damage our body. Roast dinners contain many potentially harmful pollutants.     3     When exposed to cooking emissions, people actually had DNA damage. It can be associated with cell repair processes that trigger cancer—causing genetic changes.     4     And what can we do with it?

As far as cooking emissions are concerned, no one is suggesting switching to takeaways.     5     For example, cooking meat at high temperatures with lots of fat produces more harmful emissions than boiling pasta. Besides, opening windows and using cooker hoods are preferable so that we can enjoy the roasted meat without those undesirable effects.

8 . The song of the Florida grasshopper sparrow is unusual and surprisingly insect-like. But it almost fell silent forever. In 2012, Joel Sartore, the founder of National Geographic Explorer and Photo Ark received a call from the U. S. Fish and Wildlife Service: The songbird, an important ecological link in Florida’s dry grassland, was on the edge of extinction. With only a few dozen males showing up in counts, it was among North America’s most endangered bird species.

Sartore flew to Florida to photograph the bird and work with conservationists to raise awareness of the species’ difficult situation. The story appeared in outlets, such as newspapers, magazines and even the Internet, helping boost government funding for a breeding program. Thanks to these steps, there are now as many as 180 adults in the wild and researchers are working hard to bring the species back from the brink of extinction.

Like other examples of species survival, the push to save the sparrow is “a remarkable story of belief and cooperation,” says Sartore. It also shows what it takes to protect an endangered species: research, narratives, partnerships, resources and time. This journey shows the society’s mission to illustrate and protect the wonder of the world. Over the past 136 years, we’ve developed a unique Explorer-led model, combining science, exploration, education, and storytelling to drive impact. We support Explorer in more than 140 countries, including Sartore and others whose work appears in this issue: biologist André Green II, photographer Lynsey Addario and education advocate Ara Kusuma.

Sartore has been creating an “ark” of animal photos for 17 years. Portraits of more than 15, 000 species invite audiences to connect and care. With the society’s support, the images have appeared on landmarks and U. S. postage stamps, prompting on—the—ground conservation efforts such as an initiative of National Geographic Explorer and Photo Ark.

As Sartore says, “The sounds of birds are the sounds of a healthy planet. When we save a bird or another species, we’re actually saving ourselves.”

9 . Most people don’t know much about electric eels (鳗鱼), except that they produce electricity. Although not endangered, electric eels only live in one small region of the world and are hard to keep in captivity (圈养), so most people have never seen one.

The most important fact to know about electric eels is that they are not actually eels. Although it has a long body like an eel, the electric eel is actually a type of knifefish. Scientists have been confused about it for many years. The electric eel was first described by Linnaeus in 1766. At present, the electric eel is the only species in its family. It is only found in muddy, shallow waters surrounding the Amazon and Orinoco rivers in South America.

An electric eel living in water, needs to rise to the surface and breathe about once every ten minutes. In the wild, electric eels live about 15 years. In captivity by human being, they may live 22 years.

An electric eel has three organs in its belly that produce electricity. Together, the organs make up four-fifths of an eel’s body, allowing it to deliver low voltage or high voltage or use electricity for electrolocation. In other words, only 20 percent of an eel is devoted to its vital organs.

A shock from an electric eel is like the brief and sudden hit from an electric stick. Normally, the shock can’t kill a person. However, the eels can cause heart or respiratory failure from multiple shocks or in persons with underlying heart disease. More often, deaths from electric eels shocks occur when the sudden hit knocks a person in the water and they drown. Eel bodies are insulated, so they don’t normally shock themselves. However, if an eel is injured, the wound can make the eel vulnerable to electricity.