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。Goldfish hav...

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。

Goldfish have invaded a river in Australia, a part of the sea in Canada and a lake in Colorado. Experts 1.study rivers and lakes say they are a real problem. And it’s not the fish that started it all but humans. Pet owners get 2. (tire) of the little Nemos and Dorys. They take their fish to a nearby stream, sending their pets into the wild. By and by, many settle in and their population grows this way.

In open water, they cause big problems. These goldfish have 3. (many) food than goldfish in a tank. Some weigh as much as four 4. (pound)! Giants search for plants, fish eggs, and other treats at the bottom of the river or lake, which makes the water 5. (cloud).

Native fish have a hard time in these conditions. Once goldfish take over, they are hard 6. (remove). Officials have tried some ways, but failed. The best way is to keep pet fish out 7. rivers and lakes in the first place. People should give unwanted fish back to pet stores, where pet fish can 8. (leave).

But sometimes nature solves 9. own problems. For example, before officials in Colorado could decide what to do, help came from an unexpected source: A group of hungry pelicans (鹈鹕) 10. (eat) up all of the invaders.

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Scientists say crocodiles have outlived dinosaurs 1.some 65 million years. One reason why they are such good 2. (survive) is that they can go for a very long time without eating. And they are expert hunters,3.(use) their strong jaws to bite their prey(猎物) and then swallow it whole. When they lose a tooth they grow one right back. A crocodile can go through 8,000 4.(tooth) in one lifetime!

What does the expression “crocodile tears” mean? Simply put, “crocodile tears” are fake sadness. You pretend 5.(cry) and feel bad for something when in fact you could not care 6.(little). A great word to describe it is insincere. The phrase “crocodile tears” comes from an old myth that crocodiles would shed tears while eating their prey. A religious worker wrote that 7. a crocodile found a man by the water, it would kill him if it could. Then the crocodile would cry tears on the man, but then finally swallow 8.(he). Another myth suggests9.crocodile is very clever indeed. Crocodiles, the story goes, would cry tears as a false show of guilt or sadness to trick their prey. The prey would come closer and then become dinner.

Scientists explain that crocodiles DO create tears, but they do not cry. The tears help to clean their eyes. Crying is purely emotional and it 10. (reserve) for us humans.

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Chinese researchers have developed a robot designed to help doctors treat the new coronavirus and other1. (high) contagious (传染的) diseases. The machine has a long robotic arm attached to a base with wheels. It can perform some of the same medical examination tasks2. doctors. Cameras record the robot’s activities, 3. are controlled remotely so doctors can avoid4. (come) in close contact with infected patients. Doctors and other medical5. (worker) can operate the machine from a nearby room, or from much farther away.

The robot’s main6. (design) is Zheng Gangtie, an engineer and professor at China’s Tsinghua University in Beijing. He said that he got the idea for the device around the time of the Lunar New Year in January. At the time, 7. number of cases of the COVID-19 virus was rising quickly in the city of Wuhan. COVID-19 is the disease8. (cause) by the new coronavirus.

“Doctors are all very brave,” Zheng said. “But this virus is just too contagious. We can use robots to perform the most9. (danger) tasks. I would like to build more of the robots, but money from the university10. (run) out so far. Each robot costs about $72,000 to make.”

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Do you have a pet?1.you do, congratulations, you are likely to have a 2. (good) mental state than those who don’t, reported Time magazine

According to the report, people with pets usually have lower blood pressure, a lower heart　 rate and a lower risk of 3. (have) a heart attack. These benefits may come from extra exercise of walking and playing with pets, and stress relief for having a good “friend”.

One study shows that 4. (pet) living creatures can help people with 5. (anxious), while animal toys have no effect at all.

In a 2016 study 6. (publish) in the journal Gerontology,elderly people7. were given five crickets (蛾蟀）in a cage became happier than before.

Other researches studied the effect of pets 8. children who have difficulty reading. When the children 9. (ask) to read aloud to a dog and 10. trainer they were less upset.

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Most of us have recently experienced quarantine (隔离) to minimize the risk of meeting somebody who may be carrying the virus. It is certain 1. being under quarantine is no fun. However, with our access to food, 2. (deliver) services and the entertainment 3. (offer) by the internet, we're actually very lucky. Let's take a quick look at the history of quarantines.

The idea of quarantining sick people dates 4. ancient times. Yet the word "quarantine" first came into use in the 14th century Europe during the Black Death. People were dropping like flies from the mysterious disease, and as the death toll climbed into the millions—eventually killing 5. (approximate) half of the European population, cities began to take 6. (measure) to protect their citizens. The port city of Venice, Italy, was an important trading center with ships 7. (come) from all corners of the Earth every day. If a ship 8. (suspect) to be harboring the plague (瘟疫)，it was sent to 9. offshore quarantine and ordered to wait there for 40 days when those abroad either recovered, or 10. (likely), died. The waiting period gave rise to the term quarantinario, from the Italian word for 40.

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For months, people have told inspiring stories about their battle against COVID-19 in newspapers and videos. 65-year-old Zhao Wei 1. (complete) 65 eggshell painting works related to COVID-19 since January. She is willing 2. (donate) her creations to museums to let more people know the stories.

3. a traditional Chinese folk art, painting on eggshells has a history of more than 2.000 years. When a baby is born, friends and relatives will send eggs 4. (color) red as good luck gifts. From a variety of egg options, she chose duck eggs and chicken eggs this time, 5. can offer her more space to describe stories.

Drawing on a curved surface is quite different from doing so on 6. flat piece of paper, " Zhao said, 7. (note) that the pigments (颜料 ) cannot be too dry nor too wet. Each of his paintings 8. (feature) vivid details. The wrinkles on doctors’ protective suits and naughty expressions in children’s eyes can be 9. (clear) seen on the painted eggshells. "Although I cannot go to the frontline and save 10. (life), I can tell the heroic stories through drawing and inspire more people to defeat the coronavirus,” said Zhao

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The Chinese have a saying: “Firewood, rice, oil, salt, vinegar and tea are the seven 1. (necessary) to begin a day.” For the Chinese, tea drinking and tasting are not similar. Tea drinking can help us keep up one’s spirit 2.tea tasting has cultural meaning. Tea and tea sets should match 3. (surround) such as the breeze, the bright moon, pines, bamboo and snow. All these show the goal of Chinese culture: the 4. (harmony) unity of human beings with nature.

5. (compare) to personal characters, its flavor is pleasant, low-key and 6. (last). A friendship between gentlemen is also like a cup of tea. 7.a cup of tea in hand, enjoying the green leaves in a white china cup, you will feel the peace, 8.(leave) fame, wealth and other earthly concerns far away.

9.(similar), tea-drinking habits vary in different parts of China. Generally, flowering tea is popular in northern China; green tea 10. (prefer) in eastern China and black tea is fit for people in Fujian and Guangdong. Tea is commonly available not only in Chinese restaurants and grocery shops nationwide but also worldwide.

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Having trouble recognizing one furry panda from another? A facial recognition app will make it easy1.you. The image analysis research kicked off in 2017. A database now contains about 120,000 images and 10,000 video clips of giant pandas. Close to 10,000 panda pictures have 2.(analyse) and marked.

3.(use) the database, researchers are able to carry out automatic facial recognition on panda faces 4.(tell) one animal from another. The app and database will help us gather more precise and well-rounded data on the population, distribution, ages, birth and deaths of wild pandas, 5.live in deep mountains and are hard to track. It will 6.(absolute) help to improve efficiency and effectiveness in conservation and 7.(manage) of the animals.

The giant panda was discovered 150 years ago and named in the city of Ya'an, Sichuan. It 8.(remain) one of the world's most endangered species. According to the statistics, last year 9.number of captive pandas was 550 globally as of November. Fewer than 2,000 pandas live in the wild, mostly in the10. (province) of Sichuan and Shaanxi.

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On paper, Laos seems to have all to attract international tourists. It owns mighty waterfalls, golden temples and nearly two dozen national parks.

But the land-locked country welcomed only 4. 2 million visitors in 2016—a small 1.（achieve）in comparison with its southeastern Asian neighbors. In that same year, there 2.（be）32 million tourists in Thailand, 26. 8 million in Malaysia and over 10 million in Vietnam—all countries boasting their long and 3.（impress）beaches. As for Laos, its main problem is its lack of the three Ss—sun, sand and sea. 4., things seem to change now.

A high-speed rail link between Laos and China 5.（expect）to open in 2022, with the purpose of attracting more tourists.

The country is making a bold attempt to overcome this natural deficit by becoming the first foreign country to use Chinese technology, equipment and investment 6.（connect）with the giant nation's domestic fast and vast rail network.

If all goes as planned, Laos will be the first stop on one route of the Pan-Asia Railway, 7.aim is to connect China with all of Southeast Asia. With trains 8.（run） at speeds of up to 125 miles per hour, the inconvenience of carrying both passengers and cargo in the mountainous areas will be overcome 9.（great）.

If so, 10.those who enjoy hiking, now it cou ld, be the last chance to experience an undeveloped part of Southeast Asia before it joins its neighbors in boosting its tourism.

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The Chinese have a saying, "Firewood, rice, oil, salt, sauce, vinegar and tea are the seven 1. (necessity) lo begin a day." 2. tea is the last one on the list, we still can see 3. plays an important role in our daily life. For the Chinese, tea drinking and tasting are not the same. Tea drinking is for refreshment, while tea tasting 4. (carry) more cultural meaning. It stresses more about the ultimate goal, 5. (value) highly in Chinese culture: the 6. (harmony) unity of human beings with nature. Because of the fact that the fragrance of tea is not aggressive, tea is often compared to personal character. Its characteristics of being pleasant, low-keyed, and lasting 7. (associate) to a personal character as well as a friendship between gentlemen. Wherever you are,8. a cup of tea in hand, you can get closer to peace and relaxation. While 9. (enjoy) the green leaves in the cup, you will find fame, wealth and other earthly concerns are 10. (entire) far away. Tea is the symbol of elegance.

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