1 . Nuclear pollution is a serious global   ___________, brought to the forefront by major accidents at Three Mile Island, Chernobyl, and Fukushima. These events have demonstrated the significant health and environmental risks _________by nuclear disasters. Not only have they caused immediate health problems, such as radiation sickness and increased cancer rates, but they have also _________lasting environmental damage and genetic changes in affected communities. As a result, nuclear pollution remains a pressing concern for governments, scholars, and individuals worldwide.

When nuclear accidents occur in coastal areas, the _________environment becomes a critical concern due to the crucial role that oceans play in _________the climate, ensuring food security, and supporting the livelihoods of billions of people globally. In recent years, the increasing threats to marine ecosystems from ocean pollution have _________public awareness of the need to protect the marine environment. Studies have shown that human activities pose a _________threat to marine environments, emphasizing the importance of improving environmental management and taking measures to mitigate environmental risks.

Following the Fukushima nuclear disaster in 2011, efforts to cool the reactors by pumping in seawater resulted in the _________of a significant amount of nuclear waste in the water storage tank at the Fukushima Nuclear Power Plant. _________attempts to manage this waste, the Japanese government’s decision to release nearly 1.26 million tons of nuclear wastewater into the Pacific Ocean over the next 40 years has faced opposition __________neighboring countries, local ____________, and international environmental organizations.

This __________poses serious risks to marine life, fisheries, and human health. Radioactive isotopes present in the wastewater, such as tritium, carbon-14, cobalt-60, and strontium-90, can accumulate in marine organisms and ultimately affect human populations through the food ____________. Therefore, there is an/a ____________need for further research and mitigation measures to __________the widespread impacts of nuclear pollution on the environment and human health.

2 . In November 2020, a polar bear named Suka gave birth to several little ones, including Laerke. Laerke and her brothers and sisters were the first polar bears successfully born and _______ in the Detroit Zoo since 2004.

Days after her _______ , Laerke became significantly inactive and appeared increasingly _______. She was sent off to the zoo’s health complex for _______ , but by the time she returned home, her mom no longer _______ Laerke as her cub (小熊).

Without having any other polar bear who would _______ her, she would have to go without a _______, or so they thought. _______, that’s right when Jebbie needed a new home! Jebbie, the baby grizzly bear was _______ all by himself helplessly in Tok, Alaska, when he was ________ and taken to the Detroit Zoo, where he and Laerke had been gradually getting to know each other.

After some time, Jebbie and Laerke became best ________! The zookeepers have since posted pictures and videos of them playing, showing just how ________ they are. Together, they’re able to wrestle in the grassy tundra (苔原), splash around in the freshwater or saltwater pools, and play with toys ________.

“We’re excited that we are able to give Jebbie a home and ________ a much-needed friend for Laerke,” said Scott, chief life sciences officer of the Detroit Zoo. “This social development is critically ________ for both Laerke and Jebbie.”

5 . Yoriko, a sheepshead fish (kobudai in Japanese), first met Arakawa nearly 30 years ago. Arakawa started _________ at the age of 18. Now 79, he still loves his stays in the deep water. His _________ friendship with Yoriko is certainly one of the highlights.

“I’d say we _________ each other,” Arakawa said in an interview, “not that we talk to each other… I kissed her once. I’m the only person she’ll let _________ it.” Over time, the fish with an almost _________ face—“When looking close, you’ll think she looks like someone you _________,” Arakawa jokes—and her human companion became underwater best friends forever.

On one dive when Arakawa was visiting, he noticed Yoriko’s _________ had been badly injured. Even so, she came to greet him. Realizing she’d be _________ to catch her own food, Arakawa hand-fed Yoriko meat from crabs(蟹) he hammered open for her. _________, Yoriko bounced back from her injuries quickly. After her __________, the connection between the pair seemed to grow even stronger.

“I’m not sure if it’s the __________ of the kobudai or not. It’s probably because there is a sense of __________ between us. I guess she knows that I __________ her. So for me to be able to do that, I am __________,” Arakawa said. “I have an amazing sense of achievement.”

It sure sounds like this is one human who’s been truly caught in a net of __________—and we’ll bet Yoriko has no plans to toss(扔) him back, either.

6 . This past summer I set out on a journey to Canada’s Arctic. When I left I was wrapped in a blanket of uncertainty and ______.

But when I first met the group members, I knew I didn’t have anything to ______. The group was amazingly ______ and I was soon part of a big family boarding on an amazing ______!

Approaching the Arctic, I was repeatedly ______ with its unusual largeness and its beauty. There I flew over vast glaciers (冰河) and stood on the frozen Arctic Ocean, ______   polar bears walk in search of seal holes, and _______ wait for a meal.

However, I also learned the pollutants carried by ocean from far away have a negative ______ on all Arctic inhabitants. And global warming has put polar bears at ______ because a warmer climate means that they have a shorter time to ______ seals on the ice.

During the journey, I talked with some ______ scientists about the ruins of homes once ______ by the ancient Thule people. I made good friends with people from different parts of world.

The Arctic is a land of incredible beauty which ______ to be preserved. I’ve learned why it is so important to ______ it. This journey has made me more determined to try to ______ that I do not leave negative or harmful footprints on either Earth or its people.

9 . Kathy Xu,a high school teacher,had always wanted to see a shark in the wild.The opportunity finally _______in 2011,when she went on a snorkelling trip to the Ningaloo Reef.She was so inspired by its beauty and grace that tears _______to her eyes.

After returning home,Xu learned about the shark trade _______at one of Indonesia’s largest fish markets,on the island of Lombok.Shark parts including meat,cartilage(软骨)and teeth are cut up for export.The most prized are the fins,which _______high prices.

Curious,Xu _______her bags and headed to the fish market.There,she spoke with several fishermen.Shark fishing is _______ risky and involves hard physical work,but it is one of few ways for them to_______for their families.“I told them I’d pay them to take _______out to see these snorkelling havens,“she says.Together, Xu and the fishermen came up with the idea of snorkelling boat trips,and a deal was_______.

In late 2012,Xu________her full-time job to focus on building The Dorsal Effect, an ecotourism business she hoped would help save the declining shark________.In 2019,Xu found a female Rhynchobatus cook, a relative of the shark.The species had not been seen for more than 20 years and was believed to be________.The discovery gave scientists hope,and it could be________ for an in-depth conservation study.

In the past decade,global demand for shark fins has________-a promising result of conservation campaigns.For now,Kathy,41,is proud of the small changes she sees happening on Lombok,from the fishermen who now have a new way to________an income to the schoolchildren who learn about sharks on tours with The Dorsal Effect.

10 . Suppose you find a bright yellow bike on a street corner in the city. You hop on (跨上) it and _______. But wait — isn’t this stealing? No, it isn’t._______ shouts, “Stop! Thief!” That is _______ this free ride is just fine with the city.

You _______ find hundreds of free yellow bikes in some US cities. The idea began in Portland, Oregon, in 1994. People saw a need for _______ transportation, and they wanted to help _______ pollution. So, to get citizens (市民)_______ their cars and onto pollution-free bikes, they _______ the Yellow Bike Project.

The _______ bikes are painted bright yellow and placed throughout the city. People can hop on the yellow bike and ride to run errands (短程差事), to work ________ to school. Then, they leave the bike for the ________ rider. There have been times when bikes have been stolen, but most people ________ the rules, because they think it is not wise to ________ the bike that’s already free.

Portland’s ________ was quickly loved by a lot of people. Within two years of its starts, similar programs were ________ in cities in six other states.