Lots of cats love having cat companions, but if yours doesn't, it might act out by showing fear or aggression.

This doesn’t     1     (necessary) mean you have to give one up! "Cats show great flexibility in     2     (they) social behavior,” says Kristyn Vitale, a researcher at the Human-Animal Interaction Lab at Oregon State University, US.

She suggests     3     (separate) the cats into different areas of the house and slowly reintroducing them to one another using a method     4     (call) "Scent, Sight (遗臭)，Touch”： Take a toy or blanket from each cat and exchange them. Give each cat the other cat's scent item along     5     lots of praise and rewards so they connect the smell with good things. After doing this a few times, set up a space     6     the cats will be able to see one another through a physical barrier, like a screen door or gate. Then feed them, so they start to connect positive     7     (feeling) with the sight of the other cat. After a few     8     (success) feeding periods, you can try to introduce the cats without a barrier (障碍)——distract each cat with toys during their first meeting in the same room, so they have less time     9     (worry).

“If owners go slow and give lots of rewards, many cats can learn to accept     10     companion cat,"   Vitale says.

Busy Colombians living in a city can be pressured. But there is a place for people to relieve stress in Bogota.     1    (sit) at the top of Monserrate Hill, east of the city, the place is a protected park for hummingbirds. The area contains a forest that has turned into a peaceful and     2     (harmony) world for both people and birds.

With the hummingbirds flying from flower to flower, some people study them through binoculars (双筒镜) and     3     (other) take pictures with cameras or phones.

“Sometimes it doesn't seem real because we are close to city of eight million residents     4     generate noise every day,” says Camilo Cantor, a caretaker in the park, whose job is to mix water and sugar and put it in bird feeders along a 300-meter path “The park is     5     (true) special place, like an oasis (绿洲). It is place where people can go     6     (ease) stress, forget about troubles and get     7     break from busy city life,” he added.

Ten years ago, the hill     8     (destroy), mercilessly and completely, meaning there were no trees left on it. But workers began to replant local trees and flowers to bring the forest back     9     life. Presently, visitors to the park can see over100 species of birds there.

Hummingbirds can     10     (find) only on the American continent and Colombia is home to many different kinds.

Shanghai is a window into a China that is open to the world. Shanghai is the place where East meets West,     1     where China meets the world. Shanghai culture is amazing, and the city is filled with smart people, dynamic interactions, a     2     (willing) to move and an appetite for being modern while embracing diversity and creating     3     business friendly environment. Shanghai is a people-centric city. I stayed in Shanghai during the pandemic and now my perception of the city     4     (change) as 1 experienced a city that cares about its citizens regardless of their nationality and origin. I felt     5     (protect) and safe during the crisis. I was very touched when Shanghai set up a hotline for foreigners to help     6     (they) during the crisis.

Shanghai is a big city in the world. While it is     7     (deep) rooted in Chinese culture, Shanghai has also moved     8     the times and become a modern metropolis From doing sports and running on Bund to traditional Chinese art or modern Western art museums, every activity is feasible in Shanghai.     9     I like the most are the traditional wet markets, restaurants     10     (offer) various dishes and the numerous cultural activities that are available there.

Cities are diverse ecosystems, and a large number of species share our urban areas. As our city spreads, we need think about     1     it is like for other species to have human neighbors.

Because cities     2     (build) for humans, they do not always provide suitable habitats for wildlife. For example, most city parks are kept neat and tidy so that humans will find them     3     (pretty) than before. But when we cut grass or plant flowers, we destroy natural habitats.

When a bridge in Austin, Texas was repaired, engineers added small gaps running along the length of its bottom,     4     made a good home for bats, and soon the bridge was the home of thousands of bats. At first, people were afraid     5     the bats. Now, they have come to value     6     (they) winged neighbors. The bats are a tourist     7     (attract), and they eat lots of bugs every night.

There are also structures built with the objective of     8     (bring) wildlife into the city. The Beijing Olympic Forest Park is a good example. The park     9     (use) native plants and created open, natural spaces for wildlife. The result is a zone where over 160 species of birds can move about     10     (free). If we learn to share our space, we can become better neighbors to the wildlife around us.

Of all the events in the universe, solar eclipses may lead to the     1    (great) change in animal behavior.    2    (puzzle) animals that are active during the day head back to their night places while night animals think they've overslept.

When the sun, moon and the earth are     3     a straight line, there will be an eclipse, so that the moon completely     4    (block) the sun. Around the world, when a solar eclipse occurs, unusual phenomena in animals are often reported.

Some spiders start breaking     5    (they) nets during the eclipse, just as they usually do at the end of the day. Once the solar eclipse has passed, they will start to rebuild them.     6    (similar) , fish and birds,     7     are active during the day, go to their night resting places while bats come out. They seem to be tricked by     8     sudden darkness.

Once it     9    (observe) that hippos in Zimbabwe left their rivers during an eclipse, and headed towards their night     10    (feed) places on dry land. In the middle of their journey, the solar eclipse passed, daylight returned, and the hippos gave up their efforts.

Tianjin is an important stop on one of the eight major bird-migration routes     1     North Asia to Australia, and many species rest in Beidagang’s coastal area before flying to Australia or New Zealand. The birds will return to Tianjin on their northward migrations that go as far     2     the North Pole. Beidagang Wetland     3    (cover) nearly 350 square kilometers, including an area of about 115 sq km, in the southeast of the Binhai New Area. The wetland is essential for the birds’ breeding and growth. “Without it, they may be in danger during their migrations,” experts say.

Beidagang Wetland Management Center deputy director Sun Baonian says they’ve made great efforts to improve rare — bird protection in recent years.     4     total of 1,347 Oriental storks have been identified in the wetlands,     5    (account) for nearly 45 percent of I he species’     6     (globe) migration population, he says. They prefer to nest in high trees and buildings. Since Beidagang doesn't have enough high trees, the center has set up 20 artificial nesting areas on poles, 13 of     7     have been used by the waterfowl (水禽). And 17 chicks were born in the wetlands late last year.

The center also offers “homes” for volunteers and tourists, who come to learn more about wetland protection and enhance their     8    (aware) about how to protect the wetlands and birds.

The project     9    (support) by the International Union for Conservation of Nature since 2012, following a high-level meeting in South Korea. In 2016, the IUCN encouraged China     10    (apply) for UNESCO status for the sites.

7 . 阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

The return capsule of China's Chang'e-5 probe touched down in Siziwang Banner, north China's Inner Mongolia Autonomous Region, Dec. 17, 2020. The Chang'e-5 mission       1     (successful) brings back China's first samples collected from the moon.

As China's most complicated space project, the Chang'e-5 mission has achieved the sampling outside the earth and returning for the first time.       2     is another major achievement in overcoming difficulties by giving full play to the     3       (advantage) of the new nationwide system, marking a great step forward in China's space industry. This will contribute to deepening the     4     (understand) of the origin of the moon and the evolution history of the solar system.

Noting that there is no end for space exploration, all members     5     participated in the Chang'e-5 mission     6     (carry)   forward the lunar exploration spirit of pursuing dreams, daring to explore, cooperating in tackling difficulties and win-win cooperation, so as to start new interplanetary（太阳系内的）exploration and contribute to building the country into a major power in space and the building of a community with a       7     (share) future for humanity.

Chang'e-5 mission has achieved many major breakthroughs including China's first lunar surface sampling and sealing, first liftoff     8     the moon, first rendezvous and docking（交会和对接）in lunar orbit, and first spacecraft carrying samples     9       ( re-enter) the Earth's atmosphere.

The success of the Chang'e-5 mission     10     (mark) a conclusion of China's current lunar exploration project.

Without the usual smoggy days, local     1    (resident) have been happy with the air quality since the heating season started. They open the window to air their homes. In social media, pictures of blue skies and white clouds     2    (frequent) appear,     3    (show) people's excitement with the clear days.

In Shanxi,     4     major coal production province, burning coarse coal(粗煤)for heating used to be a main source of air     5     (pollute). The government has been striving to change all this. It has launched a campaign to replace coarse coal     6     clean fuels for heating since 2017.

More than 38 percent of the heating companies- in Shanxi had applied advanced equipment with higher efficiency and     7    (low) emissions (排放)by the end of 2019,     8     (compare) with 25.5 percent at the end of20l7. It     9     (estimate) that the number can reach 50 percent by the end of this year,     10     is the goal of the government.

Pioneering underwater photographer David Doubilet is a master craftsman,     1    combines technology and capture (捕捉) life underwater,         2    (bring) images back to the surface for those who might never see those sights with their own eyes. Entering the sea as a journalist, artist, and         3     (explore), Doubilet documents both the beauty and the   devastation (破坏) in our oceans.

He believes that the photography has the power         4     (educate), and influence change. Doubilet is deeply concerned about the future of the oceans. When he     5       (ask) what sort of powerful stories he’d like to tell through his work, he says, “Right now, we’re   telling the most     6    (meaning) story in the world. Doubilet and his wife, Jennifer Hayes, are working on a National Geographic project     7     (name) “Coral Status, the Science and the Future”.

They are looking at coral worldwide to see how it’s changed, and changing. “A lot of climatologists are thinking coral may be one of     8     greatest indicators (指示者), the thermometer of the health of this planet. We’re looking at reefs that are thousands     9    years old, and in the last four and five years they have     10    (complete) died. That’s what happens when you have a warming ocean.

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 Africans 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 facing     3     (disappear).

Across Africa, all giraffe populations     4     (decline) by over 70 percent in the past 20 years. Main reasons are illegal hunting, land degradation (恶化) and lack     5     living places. The decrease led the IUCN Red List, an authoritative indicator of the health of the worlds biodiversity, to     6     (official) list giraffes as one of the endangered species in December 2016.     7     is now clear that they need conservation efforts.

To better understand the wildlife found here, Wildwatch Kenya seeks     8     (identify) and track the giraffes in conservation field sites. It’s also high time that citizen scientists     9     (invite) to help researchers look through the tens of thousands of photos taken by cameras     10     (place) in strategic spots throughout the sites.