To observe Tibetan antelopes, we made a trip to Tibet. There we made out     1    herd of graceful animals. We    2    (strike) by their beauty when watching them across the green grass. However, I was reminded of the danger they are in. They are being hunted    3    (legal) for their valuable fur.

To protect them, the Changtang National Nature Reserve was set up,    4    is a shelter for the animals and plants of northwestern Tibet.

In the 1980s and 1990s, the population dropped badly because of being shot to make profits and the loss of     5    (they) habitats. In order to prevent this species from    6    (extinct), the Chinese government took    7    (effect)measures to place it under national protection. Its population has recovered and it was removed from the    8    (danger) species list in June 2015. But the government didn’t intend    9    (give) up the protection programs. To save wildlife, we should learn to exist    10    harmony with nature.

Northern Kenya is a vast, varied and breathtakingly beautiful landscape    1    you can find the “Towers of the Savanna” — reticulated (网纹的) giraffes. They are one of Africa’s most impressive and popular animals, and yet the    2    (adore) creatures are still little studied and not well understood. However, before we could begin to research into these giraffes, they are being threatened with    3    (extinct).

According to Giraffa camelopardalis reticulata, across Africa, all giraffe populations    4    (decline) by over 70 percent in the past 20 years from 36,000 to less than 9,000 today. The main    5    (element) behind the unpleasant situation appear to be illegal hunting, land degradation (恶化) and lack    6    habitat. The decrease led the IUCN Red List, an authoritative indicator of the health of the world’s biodiversity, to    7    (official) list giraffes as one of the endangered species in December 2016.     8     is now clear that they need conservation efforts.

To better understand the wildlife found here, Wildwatch Kenya seeks    9    (identify) and track the giraffes in conservation field sites. Citizen scientists are called to help researchers look through the tens of thousands of photos taken by cameras    10    (place) in strategic spots throughout the sites.

Litter is everywhere，doing great harm     1     the environment and life on our planet.Jeff Kirschner，who wants to build a litter-free world，started a global community named Litterati     2       (settle)this problem.

The story began with his 6-year-old daughter.One day they were going on a hike when the girl noticed a     3     (break)plastic tub(浴盆)in a river.She said，“Daddy，that doesn’t go there.”That took Kirschner by surprise.He，like many adults，had become so used to the rubbish around them that he hadn’t given it a second look.    4     his daughter said reminded him of the serious problem our planet faces.

Jeff started to take       5    (act).He created Litterati，an app that makes it fun to pick up litter.The idea is       6    (fair) simple:Spot a piece of trash，take a photo，post the photo online and then put the litter into dustbins.

    7     (see)that Jeff was keeping a record of the positive impact he was having on the planet，people worldwide started participating.Up to now，over 2，500，000 photos posted by 3,500 people from over 40 countries     8     (find)their way to Litterati’s digital landfill.

Litterati is more than an app.It is a highly     9     (effect)solution to a pressing issue.Wherever you live，whatever you do and       10     you are，join Litterati to make the world a cleaner and healthier place to live in.

There was a job vacancy for taking care of the Great Barrier Reef!

    1     (locate) off the coast of North-east Australia, it is the     2     (large) living thing on the planet. About     3     size of Japan, it even can be seen from outer space. More than 25 million years old, the Great Barrier Reef is made up of living coral     4     (grow) on dead coral. Now this unique and delicate place is under threat from pollution and climate change.

    5     (get) this job, the candidates needed to prove why they were the best person to do the job. Out of the thousands of applicants, eleven     6     (elect), including a young woman from China. Eventually, Ben Southall from the UK received the job offer.

Ben did a lot during his time     7     an island caretaker. Besides blogging, he made an umber of appearances on television to argue in favor of its     8     (defend). Whether it was a genuine job offer     9     an eye-catching marketing event isn’t really important. The most important thing was that people all over the world became aware of the beauty of the ocean in the area. What’s more, they came to understand the delicate balance     10     the environment exists in and what can, and must, be done to protect the reef. That way, it will remain a safe habitat for wildlife and a dream destination for tourists.

With economy development there comes a time when the old must give way to the new.     1     (keep) the right balance between progress and the protection of cultural sites can be     2     big challenge.

Big challenges, however, can sometimes lead to great solutions. In 1950s，the Egyptian government wanted to build a new dam     3     the Nile. But water from the dam would     4     (possible) damage a number of temples and destroy cultural relics. After     5     (listen) to the scientists and citizens, the government turned to the United Nations for help. After a process of     6     (prepare), finally a document     7     (sign), and the work began in 1960.

Temples and other cultural sites were taken down piece by piece, and then moved and put back in a place     8     they were safe from the water. In all, thousands of engineers and workers rescued 22 temples and     9     (count) cultural relics.

The project ended in 1980, it was considered a success. Not only had the countries found a path to the future, but they had also learned that     10     was possible for countries to work together to build a better tomorrow.

Wang Tianchang and his family moved into the Gobi Desert 22 years ago. They have been fighting with the desert ever since,     1     (become) a symbol of China’s anti-desertification (防治荒漠化) campaign.

As     2     native of Gansu Province, Wang grew up with the Gobi Desert. In 1998, Wang’s family moved into the desert. They started planting bushes (灌木). To fund their efforts, they sold most of their farm animals and there were only 6 sheep left to support themselves. To make matters     3     (bad), the trees they had planted in the first two years     4     (blow) away by strong winds, because they weren't familiar with the environment. Then they learned that adaptable grasses were ideal for holding down the sand. A bush     5     (know) as the sweet-vetch has an 80 percent survival rate even in severe desert conditions,     6     has become a key part of the Wang’s efforts.

Now, although Wang is suffering from serious health     7     (problem) and is in his late 70s, he has no plans       8     (quit) his mission. His efforts have not gone unnoticed and have won several honors for his contributions     9     local greening. The Chinese government not only appointed (委任) Wang Tianchang and his sons as forest ranchers (大农场主), but also started funding their work. The family’s home is now surrounded by a     10     (beauty) vegetable garden, proving that land can in fact be transformed from the desert.