Wu Yuren, a 74-year-old retired (退休的) professor of physics from Tongji University (普及) of science.

Wu has already been in science popularization for many years. However, science popularization is never an _______ task.

Translating difficult physics principles (原理) into easy-to-understand language requires both a deep _______ of physics and a strong ability to express and show the principles with experiments. And it is even more difficult to teach science to children.

To help solve these problems, Wu and her team _______ short-form videos five years ago. Exciting physical experiments have been shown to people in the videos since then. To _______ surprise, the videos are popular with people of all ages. So far, Wu’s popular science videos have attracted over 1 million _______ on the Internet.

In her videos, Wu often _______ a multifunctional vest (多功能马甲), which has many pockets all over. Like Doraemon’s pocket, her pockets are _______ of magical “toys”, such as water bottles, coins and glasses. She uses them as teaching tools. She is _______ able to make use of these everyday objects to explain complex phenomena (复杂的现象) found in the field of physics.

“Physics is very _______. I hope to tell teachers and kids how to teach or learn physics,” she said. _______ more and more people can realize the beauty of physics and enjoy endless fun in the world of science, she feels that all of her efforts are worth it.

Living in a forest in the city? This sounds like something out of a fiction story. However, this has become a reality for some people in Turin, Italy.

25 Verde, an apartment building in Turin, looks like a forest. The building has five floors and 63 residential（住宅的） units. From outside, it looks like a modern tree house. One hundred and fifty trees grow from terraces（阳台）and green gardens cover the roofs. Inside the building, there is a garden in the center. It also has small ponds in the yard, where people can relax during the summertime. From the terraces, people can enjoy the perfect view of the Alps（阿尔卑斯山）. People living on the top floor can enjoy their own garden. 25 Verde isn’t just a feast（盛宴）for the eyes, it also serves a bigger purpose. With its trees, the building takes in about 200,000 liters（升）of CO₂ and produces 150,000 liters of O₂ an hour. This protects people from air pollution. The building also has a heating and cooling system that uses groundwater to save energy.

All of these make the building stand out on its corner of the city. For the people of the building, going home must feel like a dreamlike experience. This wonderful piece of modern building shows that nature and people can live together with thoughtful planning!

A report has shown that many people look at their mobile phones when crossing the road. When they focus on their screens, they won’t notice the surrounding environment. That’s why you often see traffic accidents in many places.

Recently, hundreds of pedestrians (行人) in Tianjin have been punished for looking at their phones or other devices(设备) while crossing the road. Since Jan. 1, the government has been setting rules to control such behavior and has punished at least 345 pedestrians. The rules stipulate that distracted(思想不集中的) pedestrians first receive a warning or possibly a fine of 50 yuan if they refuse to correct it.

The warning is not a simple reminder, just like verbal persuasion(言语劝说), but it is a legal(合法的) process with a legal punishment notice. Those who refuse to solve it with the traffic police or whose behaviors have harmed other people’s traffic safety will be fined 50 yuan.

The new rule is aimed at raising people’s sense in safety when they focus on their screens while walking.

There is a rising number of people who focus on their screens while crossing roads, which raises the risk of traffic accidents. And the strict measures in traffic management are improving pedestrian safety, as the traffic death has dropped by 10 percent year-on-year on average (平均). More measures are in great need to help protect local people’s lives. Many people have shown their support for the rules on social media.

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There have always been differences between one generation and the next. We call this the generation gap(代沟). In the past, these differences were mainly about clothes or music. Nowadays, differences in the use of technology are also creating a gap.

Today’s teenagers were born in the digital age and are the first generation to grow up with new technology. Computers, the Internet, e-mails, smartphones and text messaging are all part of their everyday lives.

But how do these create the generation gap? Well, young people today are sometimes called “digital natives(原住民)” because they are “native speakers” of the new language of computers and the Internet. In the same way, old people are called “digital immigrants(移民)”. They grew up without digital technology and now have to learn this new “digital language”. Scientists think that when a language is learned later in life, it goes into a different part of the brain. This means that young and old people think and process information differently because their brains are organized in different ways.

As teenagers are more likely to use lots of different technologies in their daily lives, they can often do three things at the same time. A study discovered that most teenagers can fit 44 hours of activity into just one day! Teenagers are better at multitasking(多任务处理) than their parents because their brains are organized differently.

So the next time your mom doesn’t understand how you can talk on your phone, use your computer, and listen to your CD player at the same time, tell her that it’s the “generation gap” and that you’re “multitasking”!

71. 人工智能与5G时代已悄然来临，科技逐渐融入人类生活。随处可见的人工智能，让生活越来越便利的同时也带来许多的问题。假设你是李华，用英文给你的笔友Mike写一封信，谈谈人工智能的现状、发展以及你对人工智能的看法。词数80左右。

Situations of artificial intelligence: ①The future of computer science ②Make a machine think like a human ③...
Studies of its development: ①Resolve scientific problems ②Develop other science ③...
My attitude about it: ...

Long time no see. I want to share with you some ideas about artificial intelligence.

Yours,

Li Hua