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—Oh, a pair of socks ________ on the sofa. Are they yours?

It both technology and the preferences.

This our habits.

carrying wallets, people pay with their phones.

In the past, people paid in cash, but now is widely used.

For example, smartphones in our daily lives.

Today, online shopping has become popular activity.

When the first humans to leave their homes over 100,000 years ago in of new places to live and better sources of food, they did it on foot. Humans continued walking across the globe for the next 94,000 years, about 6,000 years ago when a number of important changes took place. For instance, in the Asian country of Kazakhstan, people started to ride horses. this meant that people could travel further and faster, transporting large amounts of goods was still a difficult job. That all, however, a few hundred years later with the invention of the wheel.

Who first invented the wheel? We will never know for sure, but the inventors first used wheels to make pottery. Later, they realized that they could also use them to transport people and things. They soon wheels to horse-pulled vehicles. Farmers were suddenly able to transport their goods to markets far away. This invention increased national and trade.

The wheel changed the way villages, towns and even countries did with each other, but it wasn't perfect. The roads were old walking paths.

For example, when planning a journey, you need to o everything and make budgets for expenses (费用)—like calculating how much money to spend on train tickets, hotel stays and meals, and so on. Numbers also help us r information clearly, such as showing population change in a graph. Without numbers, our lives would be c different, with no way to count, plan, or share key information.

When you practice it, you need to move your arms, your legs, your shoulders and your neck often. So if you practice often, it's good for your health. Taijiquan is also an art. People play it to the soft music. It can make you relaxed and calm. You will enjoy yourself when you play it. Taijiquan is one of the items of China's National Intangible Cultural Heritage (非物质文化遗产).

Taijiquan is also a kind of wushu. You use your hands to pull and push, you use your legs to move, and you use your shoulders to get out of the way of danger.

Now Taijiquan is not only famous in China, but also in other countries. Why not turn on the music and play Taijiquan with me now?

A. Taijiquan is a kind of sport.

B. More and more foreign people enjoy playing Taijiquan.

C. It's popular with old people in China.

D. It isn't so quick as common wushu, but it is also strong and powerful.

E. Besides (除……之外) being a sport, it's also like dancing.

A Chinese research team has developed 3D printing techniques that can create clothes with the ability to change temperatures. The technology they used makes materials change with the environment. The team placed an object in the clothing that could be transformed (转换). It also absorbs (吸收) or gives off heat depending on the wearer's body temperature. Zhang Yongyi, a Chinese Academy of Sciences researcher, said it was the first time such clothing had been made using a controllable 3D printing method.

Scientists in South Korea have developed a kind of wearable clothes that create electricity (电) as wearers keep moving. Of course, it doesn't take much time or effort for people. Wearers only need to move naturally to power small electronic objects. The inside of the clothes produces energy, which is then stored. Although the clothes have an electronic object built in, they feel completely normal. Kim Sang-Woo, a professor at Sungkyunkwan University, is proud of his team's development, saying, "It feels like a normal jacket."

In another amazing study, clothes could serve as devices (设备) themselves. A team of engineering students from the University of Washington, the US, have led these efforts by putting a special thing into cotton T-shirts. The clothing can then send messages that can be received by cellphones.