1 . Covid-19 has brought a great deal of trouble for all of us since March 2020. During this time, mobile phones have been the solution for the boredom and restlessness caused from staying indoors. The most downloaded apps on play store 2020 are;
TikTok
TikTok was the most downloaded app. With over 111.9 million downloads, TikTok has seen a huge growth in 2020, twice more than what it got in 2019. 20% of its total downloads were from India and around 9. 3% of the total downloads were in the US.
Zoom
Zoom was the second most installed app in the overall downloads category. With nearly 94. 6 million installs, Zoom is the most used app for online meetings and virtual classrooms. 17% of its downloads were in the US and India. Offices and educational institutes were shut down and to continue working and studying from home, people relied heavily on Zoom for video conferencing and calling.
WhatsApp ranked third in overall downloads with more than 100 million downloads. It is one of the most popular and widely used chat applications; WhatsApp also supports communication between international phone networks.
It ranked fourth in the overall downloaded list. Facebook is the world’s most popular social networking application. Facebook builds technologies that give people the power to connect with friends and family, find communities and grow businesses.
1. What do we know about TikTok?| A．It is an India-based app. | B．It has most users in America. |
| C．It is used for growing business. | D．It has doubled its download than in 2019. |
| A．TikTok. | B．Zoom. | C．WhatsApp. | D．Facebook. |
| A．Communication. | B．Training. | C．Teaching. | D．Payment |
2 . Journey Back in Time with Scholars
Classical Provence(13days)Journey through the beautiful countryside of Provence，France，with Prof. Ori Z. Soltes. We will visit some of the best-preserved Roman monuments in the world. Our tour also includes a chance to walk in the footsteps of Van Gogh and Gauguin. Fields of flowers, tile-roofed(瓦屋顶)villages and tasty meals enrich this wonderful experience.
Southern Spain(15days)
Spain has lovely white towns and the scent(芳香)of oranges，but it is also a treasury of ancient remains including the cities left by the Greeks，Romans and Arabs. As we travel south from Madrid with Prof. Ronald Messier to historic Toledo，Roman Merida and into Andalucia, we explore historical monuments and architecture.
China’s Sacred Landscapes(21days)
Discover the China of “past ages,” its walled cities，temples and mountain scenery with Prof. Robert Thorp. Highlights(精彩之处)include China’s most sacred peaks at Mount Tai and Hangzbou’s rolling hills，waterways and peaceful temples. We will wander in traditional small towns and end our tour with an exceptional museum in Shanghai.
Tunisia(17days)
Join Prof. Pedar Foss on our in-depth Tunisian tour. Tour highlights include the Roman city of Dougga，the underground Numidian capital at Bulla Regia, Roman Sbeitla and the remote areas around Tataouine and Matmata，uique for underground cities. Our journey takes us to picturesque Berber villages and lovely beaches.
1. What can visitors see in both Classical Provence and Southern Spain？
| A．Historical monuments. | B．Fields of flowers. |
| C．Van Gogh’s paintings. | D．Greek buildings. |
| A．France. | B．Spain. | C．China. | D．Tunisia. |
| A．White towns. | B．Underground cities. | C．Tile-roofed villages. | D．Rolling hills. |
3 . Race walking shares many fitness benefits with running, research shows, while most likely contributing to fewer injuries. It does, however, have its own problem.
Race walkers are conditioned athletes. The longest track and field event at the Summer Olympics is the 50-kilometer race walk, which is about five miles longer than the marathon. But the sport’s rules require that a race walker’s knees stay straight through most of the leg swing and one foot remain in contact (接触) with the ground at all times. It’s this strange form that makes race walking such an attractive activity, however, says Jaclyn Norberg, an assistant professor of exercise science at Salem State University in Salem, Mass.
Like running, race walking is physically demanding, she says, According to most calculations, race walkers moving at a pace of six miles per hour would burn about 800 calories(卡路里) per hour, which is approximately twice as many as they would burn walking, although fewer than running, which would probably burn about 1,000 or more calories per hour.
However, race walking does not pound the body as much as running does, Dr. Norberg says. According to her research, runners hit the ground with as much as four times their body weight per step, while race walkers, who do not leave the ground, create only about 1.4 times their body weight with each step.
As a result, she says, some of the injuries associated with running, such as runner’s knee, are uncommon among race walkers. But the sport’s strange form does place considerable stress on the ankles and hips, so people with a history of such injuries might want to be cautious in adopting the sport. In fact, anyone wishing to try race walking should probably first consult a coach or experienced racer to learn proper technique, she says. It takes some practice.
1. Why are race walkers conditioned athletes?| A．They must run long distances. |
| B．They are qualified for the marathon. |
| C．They have to follow special rules. |
| D．They are good at swinging their legs. |
| A．It’s more popular at the Olympics. |
| B．It’s less challenging physically. |
| C．It’s more effective in body building. |
| D．It’s less likely to cause knee injuries. |
| A．Getting experts’ opinions. |
| B．Having a medical checkup. |
| C．Hiring an experienced coach. |
| D．Doing regular exercises. |
| A．Skeptical. | B．Objective. |
| C．Tolerant. | D．Conservative. |
4 . The connection between people and plants has long been the subject of scientific research. Recent studies have found positive effects. A study conducted in Youngstown，Ohio，for example, discovered that greener areas of the city experienced less crime. In another，employees were shown to be 15% more productive when their workplaces were decorated with houseplants.
The engineers at the Massachusetts Institute of Technology(MIT)have taken it a step further changing the actual composition of plants in order to get them to perform diverse，even unusual functions. These include plants that have sensors printed onto their leaves to show when they’re short of water and a plant that can detect harmful chemicals in groundwater. ＂We’re thinking about how we can engineer plants to replace functions of the things that we use every day,＂explained Michael Strano, a professor of chemical engineering at MIT.
One of his latest projects has been to make plants glow(发光)in experiments using some common vegetables. Strano’s team found that they could create a faint light for three-and-a-half hours. The light，about one-thousandth of the amount needed to read by，is just a start. The technology, Strano said, could one day be used to light the rooms or even to turn trees into self-powered street lamps.
In the future，the team hopes to develop a version of the technology that can be sprayed onto plant leaves in a one-off treatment that would last the plant’s lifetime. The engineers are also trying to develop an on and off＂switch＂where the glow would fade when exposed to daylight.
Lighting accounts for about 7% of the total electricity consumed in the US. Since lighting is often far removed from the power source(电源)-such as the distance from a power plant to street lamps on a remote highway-a lot of energy is lost during transmission(传输).Glowing plants could reduce this distance and therefore help save energy.
1. What is the first paragraph mainly about?| A．A new study of different plants. |
| B．A big fall in crime rates. |
| C．Employees from various workplaces. |
| D．Benefits from green plants. |
| A．To detect plants’ lack of water |
| B．To change compositions of plants |
| C．To make the life of plants longer. |
| D．To test chemicals in plants. |
| A．They will speed up energy production. |
| B．They may transmit electricity to the home. |
| C．They might help reduce energy consumption. |
| D．They could take the place of power plants. |
| A．Can we grow more glowing plants? |
| B．How do we live with glowing plants? |
| C．Could glowing plants replace lamps? |
| D．How are glowing plants made pollution-free? |
5 . The Torch Festival (火把节) is a traditional festival which is celebrated among some ethnic groups in southwestern China, such as the Yi, Bai, Hani, Lisu, and Lahu, etc. It usually falls on the 24th or 25th of June, with three days of celebrations. The festival came from worship (崇拜) of fire by ancestors (祖先). For some ethnic groups, it’s a tradition in the festival for elders to share farming experience with young people and educate them about taking care of crops.
During the festival, big torches are made to stand in all villages, with small torches placed in front of the door of each house. When night falls, the torches are lit and the villages are bright. At the same time, people walk around the fields and houses, holding small torches and placing the torches in the field corners. Inside the villages, young people are singing and dancing around the big torches that keep burning throughout the night. Other activities like horse races are also held during the festival.
In a horse race of the Yi people in Yunnan, torches are used to form hurdles for riders to get through. The Hani people in Yunnan traditionally tie fruits to torches with strings. When the strings are broken after the torches are lit, people struggle for the fruits for good luck.
For the Lisu people in Sichuan, the festival is an occasion for holding torch parades. Big torches are carried by teams of people, which is like a fire dragon. If different teams meet, it’s a tradition to exchange the big torches with one another.
1. What can we know about the Torch Festival from the first paragraph?| A．It has nothing to do with farming. |
| B．Its celebrations usually last two days. |
| C．It is a traditional festival of all China. |
| D．It is a festival to show worship of fire. |
| A．ancestors. | B．young people. |
| C．elders. | D．ethnic groups. |
| A．Why the festival is enjoyed. | B．Where the festival is celebrated. |
| C．How the festival is celebrated. | D．What torches are used for the festival. |
| A．Holding torch parades. | B．Tying fruits to torches with strings. |
| C．Struggling for fruits for good luck. | D．Using torches as hurdles for a horse race. |
6 . Many of the Earth's creatures die because of humans' choices. These choices have nothing to do with food or shelter or anything else that helps humans survive. What kills millions of animals all over the world is that humans want to make money by doing so.
People use parts of animals for everything from hats to handbags, from jewelry to ashtrays and to make powders that supposedly improve a person's life. Deciding that a species is endangered and protecting it by law are not always enough. People who kill wildlife illegally rarely get caught.
During the late 1980s, saving elephants became a popular cause. Wildlife protection groups made sure everyone saw pictures or films of elephants with their faces cut off for their ivory. These groups also proved that certain populations of elephants were decreasing. As a result, most people stopped buying objects made of ivory. Laws against poaching (偷猎) were made stronger. Many countries made importing ivory illegal. Killing elephants for their Ivory became more risky and less profitable (有利可图的).
However, concern for certain species will become weak after a while. In the late 1970s, people protested (抗议) against the killing of seal babies. Everyone was shocked to see young seals being killed in their icy habitat. The cruel activity stopped. But ten years later, the number of seal babies killed was higher than ever.
Other animal protection movements have come and gone, such as saving the whales and protecting dolphins. The whale population appears to have increased for now. And the laws are finally changed in America to protect the dolphins that swim with tuna fish in parts of the Pacific Ocean.
In the years to come, people's attention will probably turn to some other endangered species. Plenty of them urgently need attention. During this time, will the elephants be forgotten?
1. What leads to the disappearance of millions of wild animals?| A．The growing human population. |
| B．Humans’ hope for making a fortune. |
| C．Humans’ too much need for wild food. |
| D．Not having enough laws on wildlife protection.. |
| A．Wildlife protection groups did make great efforts. |
| B．Importing ivory in all countries is illegal. |
| C．Those who killed elephants all got caught. |
| D．Hunting was completely not allowed. |
| A．To show the effort to protect seal babies. |
| B．To show an increasing number of seal babies. |
| C．To show the decrease of worry about certain species. |
| D．To show people’s protest against the killing of seal babies. |
| A．Humans should choose some rare animals to protect. |
| B．Attention must be paid to saving some endangered wildlife. |
| C．Success has been achieved in quite a few cases of wildlife protection. |
| D．Concern and movements for animal protection should be always kept. |
