The size of fish in the oceans is shrinking. A new report from Canada states fish may shrink by as much as a quarter in the coming decades, which mainly     1     (result) from global warming. The research team conducted tests on the effect of     2     (rise) ocean temperatures on the size and number of over 600 species of fish. They concluded that most fish are likely to shrink by 14-24 percent by the year 2050. The biggest changes     3    (see) clearly in tropical regions. There is     4     (little) oxygen in warmer water so fish cannot grow normally and many will migrate to cooler waters.

Lead researcher Professor William said: “We were surprised to see such a large decrease in fish size. Marine fish are generally known to respond to climate change     5     changing distribution and seasonality. But the unexpectedly big effect     6     climate change could have on body size suggests that we may be missing a big piece of the puzzle of understanding climate change effects in the ocean.” He added that overfishing and pollution will     7     (worse) the problem. “Our work shows a very     8     (worry) future for the oceans,     9     it is very important to reduce greenhouse gas emissions and develop better fish management policies     10     (adapt) to these changes,” he said.

When she was 10 years old, Ana Moreno watched buses full of tourists pull into her village. They had come to see the monarch butterflies,     1     arrive in groups each November and stay the winter in the Sierra Madre's forested peaks. At that point, Ana's goal was     2     （become） a butterfly guide, leading tours into the forest.

This year,     3    , Ana won't be leading tourists into the Cerro Pelon Butterfly Sanctuary （保护区）owing to the effect that the CO VID-19 has had     4     ecotourism from domestic and international visitors alike. Forest communities are losing tourist income, which has led to them     5     （return） to farms, while others restart cutting down trees     6    （legal）.

But forest communities across the country hold the     7     （believe） that under pressure, solutions also tend to become clear. They     8     （step） up to invite the outside world in and seek new ways to support     9     （they）.

To keep their six forest guardians on the mountain, Ana's brother and his wife have designed virtual tour packages. "I'm hoping it can save us this year," says Sharp. These virtual tours offer visitors an experience they couldn't get in person: up-close     10    （observe） of the colonies on an ongoing basis.

The Ant Forest initiative was launched by the Alipay app in 2016.     1    about 200 million trees planted on 182,700 hectares of land, it has helped to     2    (efficient) avoid almost 7.9 million tons of carbon emissions.

The initiative is in line with the Chinese government's strategy of transforming the nation into a "Green Economy".       3     (accomplish) this objective,China has been taking aggressive action in expanding its green coverage.

For example,the "Great Green Wall" was initiated in the northern region to restrict the       4     (expand) of the Gobi Desert. The Forestry Administration's monitoring report mentioned that desert lands       5     (shrink) by 24,240 square kilometers in the past decade. Moreover,China only has a small percentage of vegetated area(植被面积).     6    it has contributed to the increase in the world's green leaf area by almost 25% in the last two decades.

Our planet is at a tipping point,     7    may result in natural disasters unless urgent actions     8    (take)immediately. Here, Alipay Ant Forest shows that it is possible to rely on digital technology for a better and       9     (green) future. Several more initiatives, from not just China but all across the globe,     10     (be) under way towards a sustainable future of the planet.

The Molai Forest, named after its creator,   was once an area     1    (strike) by floods. Teenager Jadav noticed     2       sharp fall in the number of birds and snakes in nearby forest area and wetland.

The boy soon turned to his elders and asked, "What if all of us die like these snakes one day?" The grown-ups only laughed. But the boy comforted    3     (he) saying "I will make the planet greener.”

Since then, Jadav started planting bamboos in the wetland. He found a small island and planted many young trees. He worked     4    (extreme) hard at this for three long     5     (decade). His work paid off and the land became a     6    (beauty)green forest.

In 1980, Jadav worked with a team     7     carried out a tree plantation   project in Jorhat district. It took Jadav about five years     8       (complete)the project.

Forest is his home now. He regards the recognition and awards he got    9    his wealth. Jadav, now 52-year-old man, finds all his    10     (happy)in the forest.

The Yellow Crane Tower has     1    very long history.Why was the Yellow Crane Tower built?Due to the ideal location,it was built by Sun Quan as a watchtower for his army. After     2    seemed hundreds of years,its military function was    3    (gradual) forgotten and the tower was enjoyed mainly as a picturesque location.

During the Tang Dynasty,many popular poems were written in praise of the Yellow Crane Tower.It was the Yellow Crane Tower poem     4    made the tower so famous and attractive.During the following centuries,it     5    (destroy)and rebuilt several times.

The Yellow Crane Tower had different architectural features in different     6    (dynasty). However,the very tower     7    stands today is based on the one     8    (design) during the Qing Dynasty.How tall is the Yellow Crane Tower?It stands 51.4 meters high.The     9    (appear)of the Yellow Crane Tower is the same regardless of the direction it is viewed from.

On top of the tower,visitors are treated to a fantastic view of the Yangtze River,its bridge and the     10    (surround)buildings in Wuhan City.

Enjoying the fame of”The First Scenery under Heaven”，Yellow Crane Tower is one of the most famous towers south of the Yangtze River...

Have you ever heard thunder during a big snowstorm? If so, you’ve experienced an     1    (extreme)rare weather occurrence.

The things necessary for thundersnow are so uncommon     2    it’s reported that only 0.07 percent of snowstorms     3    (link)with thunder. This explains the excited     4    (react)from the witness to a recent thundersnow

Thundersnow-when thunder and lightning occur during a snowstorm-is most likely     5    (happen)during late winter or early spring when a mass of cold air meets warm air near the ground.

Patrick Market from University of Missouri, says that heavy snowfall is common during thundersnow. In a 30-year study of snowstorms     6    (concern)lightning. Market found that there’s an 86 percent chance that at least 6 inches of snow will accumulate within a 70-mile radius(半径)of the lightning. He says     7    (witness)thundersnow is a matter of being in the right place       8    the right time, but even then, you likely won’t see much.

Thundersnow is most common in the Midwest, the Great Lakes and along coasts     9    moisture(水汽) from warm water can easily evaporate(蒸发)into the colder, drier air above. Some of the places that most frequently report the rare weather event     10    (be) Wolf Creek Pass, Colorado; Bozeman, Montana; and the shores of Lake Ontario.

Wenchuan quake survivor follows in his hero’s footsteps

Twelve years ago, Cheng Qiang was a 12-year-old boy who held a sign    1    (say) ''I want to become an airborne trooper(空中骑兵)when I grow up. ''when he saw airborne troops leave     2    their rescue work in the 2008 Wenchuan earthquake. Now Cheng has become a soldier of the Chinese airborne troops, just    3     he said he would.

Looking back on the day when the earthquake happened, Cheng had a lucky escape as he had skipped school and    4     (go)swimming in a pond in Shifang,Wenchuan.But the earthquake destroyed his home and took away the    5    (life)of his little niece and his classmates.

''We survived but fell into despair, not knowing    6    to do, '' he said. Then on the second day of the earthquake came the moment he will never forget-a large number of airbome troops appeared in his hometown, carrying rescue supplies. Later, he knew Huang Jiguang was    7     at the troop unit.

Huang Jiguang is a Chinese war hero     8    sacrificed(牺牲)himself in the Battle of Shangganling during    9     War to Resist US Aggression and Aid Korea in 1952. ''Huang and I both come from Deyang, Sichuan province. The airborne troops are just like my family.'' Cheng said. ''So I made up my mind    10    (become)one of them who could bring people strength and hope, '' he said.

Fabien Cousteau was born with deep love for the ocean. His grandfather and his father were ocean     1    (explore) and documentary filmmakers. Today, Fabien     2    (follow) his family’s footstep,tryingto protect the planet’s endangered ocean life and to reach a     3    between environmental problems and market economies.

Fabien is well known for his study of sharks. In 2001,he created a TV special based on the shark attacks that     4    (occur) along the New Jersey shoreline in 1916. Then in 2003,     5    the help of a large crew, Fabien created a shark submarine that enabled him to put       6    (he) inside the shark world. For the next four years, Fabien was part of a series called Ocean Adventures,     7     offered a   rare look into some of the most fantastic ocean species. In 2010, Fabien and his team spent 31 days underwater to discover     8    climate change and pollution which are affecting the oceans.

Fabien is     9    (current) working on a documentary film about the adventures of Mission 31, as well as     10    (build) an Ocean Learning Center to provide children with the opportunity to learn about oceans.

The polar bear is found in the Arctic Circle and some big land masses as far south as Newfoundland. While they are rare north of 88°, there is evidence     1     they range all the way across the Arctic, and as far south as James Bay in Canada. It is difficult to figure out a global population of polar bears as much of the range has been     2    (poor) studied; however, biologists calculate that there are about 20,000-25,000 polar bears worldwide.

Modern methods     3     tracking polar bear populations have been employed only since the mid-1980s, and are expensive     4    (perform) consistently over a large area. In recent years some Inuit people in Nunavut     5    (report) increases in bear sightings around human settlements, leading to a     6    (believe) that populations are increasing. Scientists have responded by     7    (note) that hungry bears may be congregating(聚集) around human settlements, leading to the illusion(错觉) that populations are     8    (high) than they actually are. Of     9     nineteen recognized polar bear subpopulations, three are declining, six     10    (be) stable, one is increasing, and nine lack enough data.