2 . In habitats across the planet, animals periodically drop everything to walk, fly or swim to a new place. Some animals such as whales and geese learn migration paths by following their parents. Others, including small songbirds, gain the distance and direction of their migration within their genetic code. And some animals use a combination of genetics and culture to guide their migration.

Another group of migrators does not quite fit either model, and researchers have only recently started to figure out how they find their way. The Cory’s shearwater is an oceangoing seabird that migrates over the Atlantic every year. The young do not migrate with their parents, so culture cannot explain their journeys. And the exact paths vary wildly from individual to individual, making genetics equally unlikely.

Cory’s shearwaters are long-lived, rarely producing young successfully before age nine. This leaves an opening for learning and practice to develop their migration patterns. Researchers call this the “exploration-refinement”, and until now it has been hypothetical (假设的) because of difficulties in tracking migratory animals’ movements.

But a team of researchers has done that by attaching small geolocators to more than 150 of the birds aged four to nine. They found that younger birds traveled longer distances, for longer periods, and had more diverse paths than older birds. “We finally have evidence of the ‘exploration-refinement’ for migratory birds,” says Letizia Campioni, who led the study. Younger Cory’s shearwaters are able to fly just as fast as the adults——but they do not, suggesting that the young do more exploring, which gradually fades as they mature and settle into a preferred course.

“Although it may seem less efficient than other strategies, exploration refinement could be beneficial to birds and other organisms in a rapidly changing world due to unpredictable man-made changes,” says Barbara Frei. “It might be safer to repeat a behavior that was recently successful than to rely on patterns that were perfected long ago but might no longer be safe.”

3 . Afroz Shah, a lawyer in Mumbai, hasn’t had a weekend off in four years. But he hasn’t spent this time preparing for _________.

His mission? Saving the world’s oceans from _________ pollution.

It’s a calling he found in 2015 after moving to a community in Mumbai called Versova Beach. He had played there as a child and was_________to see how much it had _________. The sand was no longer _________ because it was covered by a layer of garbage more than five feet thick — most of it plastic waste.

“The whole beach was like a_________of plastic,” he said. “It hurt me. The _________ mess.” What Shah had seen is part of a global environmental crisis. More than 8 million tons of plastic _________in the world’s oceans each year. It’s predicted that by 2050, there will be more plastic in the ocean than fish. “Plastic in the ocean is a _________. And the sea species have no choice at all, ” Shah said. “We are ______________ their habitats.”

In October 2015, Shah began ________________ up plastic waste from the beach every Sunday morning. At first, it was just him and a neighbor, and then he began calling on others to join in. Word ________________ and with the help from social media, more volunteers got ________________.

For Shah, the work has always been a ________________ journey, but it has earned global attention. After he was ________________ as a Champion of the Earth by the United Nations in 2016, Shah now devotes nearly all of his free time to this ________________.

He’s now spent 209 weekends on this mission, ________________ more than 200,000 volunteers, some of whom are young students, to join him in what’s been called the world’s biggest beach cleanup. By October 2018, Versova Beach was ________________ clean and Shah’s cleanups expanded to another beach as well as a stretch of the Mithi River and other regions of India.

“This world talks too much. I think we must talk ________________ and do action more, ” he said when interviewed by CNN in October 2019.“We are a smart species. Well adapt. We’ll learn. And with these youngsters rising up, I see ________________.”

4 . An earthquake can strike without warning. But many injuries and deaths from this kind of natural disaster can be prevented if people follow these safety tips.

If you’re inside a building, stay there! One of the most dangerous things to do in an earthquake is to try to leave a building.     1     Drop down onto the ground. Get under an object that is not easily damaged. Hold on to it until the shaking stops. You can also get to a corner formed by two walls with your arms over your head. If you’re in bed when the quake hits, stay there and protect your head with a pillow.

    2     Don’t take shelter under trees, streetlights, telegraph poles or tall buildings. If you are driving stop as quickly as possible and stay away from overpasses, buildings, bridges or anything else that might fall or collapse over you.     3    

If you are trapped in the ruins, cover your mouth with a handkerchief or a piece of clothing. Use your cellphone to call for help if possible. Don’t shout.     4     Tap on a pipe or the wall so rescuers can find you.

Be prepared for aftershocks    5     However, sometimes they even happen months later. Therefore, if you are not in a safe position after the first shock, you should move quickly but carefully to a safer place.

5 . After years of heated debate, gray wolves were reintroduced to Yellowstone National Park. Fourteen wolves were caught in Canada and transported to the park. By last year, the Yellowstone wolf population had grown to more than 170 wolves.

Gray wolves once were seen here and there in the Yellowstone area and much of the continental United States, but they were gradually displaced by human development. By the 1920s, wolves had practically disappeared from the Yellowstone area. They went farther north into the deep forests of Canada, where there were fewer humans around.

The disappearance of the wolves had many unexpected results. Deer and elk populations — major food sources (来源) for the wolf — grew rapidly. These animals consumed large amounts of vegetation (植被), which reduced plant diversity in the park. In the absence of wolves, coyote populations also grew quickly. The coyotes killed a large percentage of the park’s red foxes, and completely drove away the park’s beavers.

As early as 1966, biologists asked the government to consider reintroducing wolves to Yellowstone Park. They hoped that wolves would be able to control the elk and coyote problems. Many farmers opposed the plan because they feared that wolves would kill their farm animals or pets.

The government spent nearly 30 years coming up with a plan to reintroduce the wolvers. The U.S. Fish and Wildlife Service carefully monitors and manages the wolf packs in Yellowstone. Today, the debate continues over how well the gray wolf is fitting in at Yellowstone. Elk, deer, and coyote populations are down, while beavers and red foxes have made a comeback. The Yellowstone wolf project has been a valuable experiment to help biologists decide whether to reintroduce wolves to other parts of the country as well.

6 . Tips for Green Travel with Kids

Travelling doesn’t mean letting go of all the eco-friendly choices we work so hard to achieve in our daily life. Here are a few tips for green travel with kids.

Booking nonstop flights whenever possible will reduce carbon emissions (碳排放). If the closest local airport doesn’t have nonstop flights to a certain place, check with other local airports to see if nonstop flights are available.     1    

It’s easy when travelling to pull in to fast food restaurants for snacks.     2     My kids love to help plan snacks. I let them create their own snacks for the trip at home.

    3     At the airport, keep your reusable bottles empty until you have passed through the security (机场安检区). Fill them up on the other side of the security checkpoint. Single-use plastic water bottles create unnecessary waste and the plastic can be harmful to your health.

    4     In addition, opening a few windows and turning off the air conditioner (空调) are also good ways to save energy. You should also help your children keep their good, green habits while travelling. Sometimes vacation can mean more than one shower each day-once in the morning and again after getting out of the pool. Pay attention to the number of showers (淋浴) and the length of showers.     5    

7 . Different colors usually stand for different feelings. Red, for example, is the color of fire, heat, blood and life. People say red is an exciting and active color. They associate red with a strong feeling like _______. Red is used for signs of _______ such as STOP signs and fire engines. Orange is the bright, warm color of leaves in autumn. People say orange is a _______ color. They associate orange with happiness. Yellow is the color of sunlight. People say it is a cheerful color. They associate yellow with happiness too. Green is the cool color of grass in spring. People say it is a refreshing color.

In general, people _______ two groups of colors : warm colors and cool colors. The warm colors are red, orange and yellow. Where there is warm color and a lot of light, people usually want to be _______. Those who like to be with _______ like red. The cool colors are black and blue. _______ are these colors, people are usually worried. Some scientists say that time seems to _______ more slowly in a room with warm colors. They suggest that a warm color is a good way for a living room or a _________. People who are having a rest or are eating do not want time to pass quickly. ________ colors are better for some offices if the people working there want time to pass quickly.

The Vikings, whose ancestors came from Scandinavia, were the first Europeans     1    (reach) America. They had lived in many places of northern Europe. In 982 AD, a man     2    (call) Eric the Red was forced to leave Iceland because of a murder, for     3    he got into trouble. Eric discovered Greenland and persuaded some people     4    (settle) in Greenland. Eric set sail again, but only half of the ships made     5    to Greenland this time.

Later a man, Biarni set sail from Iceland in search     6     Eris’s party. But he     7    (blow) off course and found himself in an unknown land, from where he     8    (eventual) reached Greenland.

In the year 1002, Leif, Eric the Red’s son, followed Biarni’s directions and sailed to     9    is believed to be the coast of present-day Canada. He also discovered Newfoundland. Actually, Eric the Red and Leif’s     10    (deed) are the first records we have of Europeans sailing to the Americas.

9 . Just as we take care of our friends and families, our homes and Mother Earth take care of us. Our homes give us a place of shelter that ________ between us and the rest of the world. The earth is a(n) _________ giver of life and the keeper of our physical and spiritual needs. Her rich ________ bring us up, give us air, and offer us cooling shade. Her waters ________ our thirst. Yet it is easy to take both of these wonderful _________ for granted. ________ the thanks you feel toward your home and Mother Earth for the gifts each   ________   you. It can help you stay   ________ of where many of the gifts in your life come from. Each time you give thanks, you’ll be ________ of the importance of caring for your home and for Mother Earth. There is a simple and beautiful _________ you can find to show your thanks. Begin by finding a ________ place where you can be alone. Sit comfortably and breathe deeply ________ you feel relaxed and then read the following out loud:

“Thank you, home, for allowing me to live ________ your walls. Thank you for allowing me to stay strong and ________ me. Thank you, Mother Earth, for the land I ________ on and farm. Thank you, plants, minerals (矿物质), and animals on the land for allowing me to ________ your beauty and your amazement of life, and for the ________ of living with all of you on this earth. Thank you for the wisdom and       ________ you bring to us.”

You can do so as often as you like and anytime you feel particularly thankful for the many gifts that you have ________. Each time you do this, you’ll strengthen your connection with all that _________ and supports you.

10 . My previous home had a stand of woods behind it and many animals in the backyard. That first year, I ______ feeding peanuts to the blue jays, then the squirrels. The squirrels had no _______coming up right to me for them. As the months went by, the rabbits saw that I was no ______ and didn’t escape. When I threw carrot slices (薄片), they even came for a nibble (啃). Slowly they came to ______ me, and by the end of the year they were eating out of my hand.

That second year, the rabbits ______ me, and one would even sit up for slices! While I was feeding them. I ______ that a groundhog who used to run away was now taking an ______ interest in this food situation. I carefully extended a long ______, with a keen eye on those teeth, and ______, there were times I would have the groundhog sitting next to a rabbit, both munching (津津有味地咀嚼) on carrots. A few months later, while ______, she would even turn her back to me._______ when she was facing away, I reached out and ______ scratched (搔) her back with my finger. She didn’t move.

By year three, the rabbits and the groundhog were back. The groundhog ______ didn’t have a problem with me scratching her back, and I got an idea. I’d always ______, while slicing up carrots, that the end looked like a cap. ______ one day, just to see what she would do, I gently ______ one on top of the groundhog’s head. Again, not a ______. The next time, I had my camera ready to record what you see here, one of several dozen such pictures. ______ she had a slice to eat, she never ______ the one on her head. It was a fair______— I got a pleasure, and she had yet another tasty treat.