Hundreds of years ago, life was harder than it is today. People didn't have modern machines. There was no modern medicine, either.

    Life today has brought new problems. One of the biggest is pollution. Water pollution has made our rivers and lakes dirty. It kills our fish and pollutes our drinking water. Noise pollution makes us talk louder and become angry more easily. Air pollution is the most serious kind of pollution to all living things in the world.

    Cars, planes and factories all pollute our air every day. Sometimes the polluted air is so thick that it is like a quilt (被状物) over a city. This kind of quilt is called smog.

    Many countries are making rules to fight pollution. Factories must now clean their water before it is thrown away, and they mustn't let dirty smoke go into the air.

    We need to do many other things. We can put waste things in the dustbin and do not throw them on the ground. We can go to work by bus with our friends in the same car. If there are fewer people driving, there will be less pollution.

    Rules are not enough. Every person must help to fight pollution.

D

    Are you nervous? Maybe you should sit in a blue room. Are you always cold? Maybe you should sit in a room painted in a "warm colour" such as soft orange. Are you often sad? Maybe you should sit in a yellow room. Some researchers believe that colour has the power to influence our feelings. They believe that colours affect(影响)everyone in the same way.

    One study was in a workplace. The researchers painted heavy boxes white and light boxes black. They want to see how colour affected the workers' feelings. Which boxes do you think were more difficult to lift? The heavy white ones? No. The white boxes were heavier but they looked light. The researchers think that this is because light colours seem light.

    Another study was at school. Researchers at the University of Alberta in Edmonton, Canada, studied children with behaviour problems in their classroom. When the walls were brown and yellow, the children's heart rate went up and they were over-active. However, when the walls were dark blue, the children's heart rate was slower and the children were much calmer. If this is true, we can think carefully about the colours around them--not just in our homes, but also in offices, in schools, in hospitals, in gyms, in museums, in restaurants and even in prisons.

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    In today's world, almost everyone knows that air pollution and water pollution are harmful to people. However, not all the persons know that noise is also a kind of pollution, and that is harmful to human, too.

    People who work and live under noisy conditions usually become deaf(聋的). Today, however, scientists believe that 10 percent (百分比) of workers in Britain are being deafened by the noise where they work. Many of the workers who print newspapers and books, and who weave(织) cloth become deaf. Quite a few people living near airports also become deaf. Recently(近来) it was discovered that many teenagers in America could hear no better than 65-year-old people, for these young people like to listen to "pop" music and most of "pop" music is a kind of noise. Besides(除此之外), noise produced by jet planes or machines will make people's life difficult and unpleasant, or even make people ill or even drive them mad.

    Nowadays the government in many countries have made laws to reduce or control(控制) noise and make it less than 85 decibels(分贝).  In China, the people's government is trying to solve not only air and water pollution problems but also noise pollution problem.

    Technology is developing fast and it has become an important part of our life. Then what will the world be like in the future?

    3—D food will be both delicious and nutritious(有营养的). We can use 3—D printers to print some basic materials.    ①    And we can go further. Scientists belive that we just need to turn on a printer in the kitchen and then we can enjoy our favourite food whenever we like.

         ②      5G network will allow many more people to get information. Big companies like China Mobile and China Unicom will start to offer 5G. It is said that promises download speeds 10 to 20 times faster than 4G. For example, we can download a film within just 1 second. But with a 4G network, it takes a few minutes. There will be much bandwidth (带宽) and we can get unlimited (无限的) information.

    Underwater cities will provide more space. The earth is becoming more and more crowded. We may turn to underwater homes, which will be built as low as 15 of the sea can be used to provide power for the homes.

         ③      For us common people on the earth, the dream of travelling around space will come true. In the coming years, spacecraft will be as popular as buses, trains and planes. We can leave our home and enter space to take an adventure (冒险). And even we will get used to living there.

    A robot will be a part of life.  Robots can do many of the same things as we humans do like driving cars. But they will be used in other areas as well. They will be able to think. They can tell the difference between right and wrong. They can feel       ④        In a word, just as Jules Verne said, "Anything one man can imagine, other men can make real."

    Do you think the people who use smart phones all the time are relaxed? A research shows that too much smart phone use in spare time can make people more stressed out.

    So what can we do in order to really take advantage of our spare time? We have collected the following activities that also take a few hours to complete, but you'll improve your health in the process (过程).

    Whether you're at home or on holiday, it's important to disconnect from the Wi-Fi. Walking in nature can do good to your health. As a professional(职业的)traveler, Samantha Brown put it in a recent passage, "I put my map in my back pocket, put down my phones and take a good, long walk. Just walk around."

    Go to bed earlier. What can help improve your mood? Extra sleep, naturally. Getting the right amount of sleep is very important to our health and studies show that we don't get enough of it.

    Read a book. And let yourself get lost in a good story. Research shows that reading can reduce(减轻) stress, keep your brain sharp and can even help you sleep better. Everyone should spend at least 30 minutes reading every day.

    Putting pen to paper is a good exercise. Try writing down your thoughts. Writing has a lot of health advantages. Besides, writing down your thoughts may even help clear your mind.

What should mobile phone buttons(按键) look like? What are Shakespeare's artistic achievements? {#blank#}1{#/blank#}

As new technologies continue to develop, many students are choosing to study STEM subjects (science, technology, engineering and math) so they can get good jobs later. {#blank#}2{#/blank#}They need ideas from artists, historians and sociologists(社会学家)— in other words, people who major in liberal arts(主修文科). 

Learning how to program is not enough. The US writer Scott Hartley mentioned it in his book. {#blank#}3{#/blank#} He points out that soft skills, including communication, collaboration(合作) and understandings of social problems, are of equal importance. 

One possible solution is to put liberal arts and STEM studies together. In fact, Lewis University in the US has started to offer a set of courses called " CS + X".{#blank#}4{#/blank#} At the University of Vermont, a program called Engineering Management connects engineering with business. Engineers need to understand markets while business people need to learn engineering. 

{#blank#}5{#/blank#}Only when we know this, can we create the greatest technology with humanity.