阅读下面短文，按要求完成各项任务。

Many people run for exercise. But what will you do if you are not a “born” runner or jogger (慢跑者)? You may still want a kind of exercise that's inexpensive and easy to do. Why not try walking?

Walking requires no special equipment (装备). It is a kind of exercise that almost any normal, healthy person can do. Walking is good for your health like jogging or running; it will just take longer. Jogging and running make your heart work harder than walking. They also put more stress on your legs and feet than walking does.

    The problem with walking is that most people don't take it seriously. But there's a big difference between serious walking and the walking that most of us do. Walking, like jogging, should have a steady and continuous motion (稳健而持续的动作).

If you want to get your exercise by walking, you need to have your own walking plan. After all, runners and joggers set goals for themselves. Walkers need goals, too. You also need to set a course to walk. Start by walking about 15-30 minutes a day. Increase your time and distance (距离) slowly. And try increasing your walking speed little by little.

If you prefer to jog or run, follow the same advice. Start off slowly. Spend most of the first few days just walking. Then, start walking and running on the same day. Run or jog a short distance, then walk for a while, then, run, then walk. Follow that pattern for 15-30 minutes a day. Slowly make each run longer and each walk shorter. Later on, you can increase your distance, speed and exercise time.

    Reading is a very important skill. 阅读也是一种提高你的英语的好方法。However, to make sure what you read isn't too difficult, it's important to know what makes texts difficult and how you can improve your understanding of them. Here are some suggestions.

    ①Understand the purpose of your reading. The way you read depends on the purpose of your reading. The kind of reading you do in class or for your homework is different from how you read a novel for pleasure in the summer holidays.

    ② Find background information. Find something out about the topic you are going to read.

    The more background information you have, the easier it'll be to understand the text.

    ③Increase your vocabulary（词汇）. The more vocabulary you have, the easier your reading will be.

    ④ Use your dictionary correctly. A common mistake is to read everything very slowly and carefully, looking up each unknown word. Sometimes this is necessary, for example, when reading exam questions. However, it takes a long time and can be very boring; it can even make understanding more difficult!

    If you've followed the above advice and still can't understand a text, then it's simply too hard for you. Stop reading and ask someone to help you. 没有人想要放弃。However, you'll just be wasting your time if you continue to work at a text that's beyond you.

    Skyscrapers are very tall buildings in a city.  Looking up at them might make you dizzy (眩晕的). {#blank#}1{#/blank#} Skyscrapers are a .wonder, whether (不管) you are looking up or down.

    How can the buildings be so tall? Something that happened during the 1880s made it possible. {#blank#}2{#/blank#} First, a man named William Jenney got the idea of using a steel frame to hold up the walls and floors (钢架支撑墙壁和地面) of a building Jenney s idea made it possible to build taller buildings so he is called the "Father of the American skyscraper" Second, the elevators （电梯）improved. {#blank#}3{#/blank#}That helped people go up and down the tall buildings more easily."

    Back in the 1880s, Jenney s first tall building was 10 stories (楼层) high. {#blank#}4{#/blank#}In 2004, Taipei 101, at 101 stories high, became the tallest building in the world. But soon the Burj Khalifa in Dubai overtook it in 2010. The 828-meter building has 163 stories.

    {#blank#}5{#/blank#} For example, Shanghai Tower in China, One World Trade Center in the USA, Abraj Ai-Bait Clock Tower in Saudi Arabia, etc. All of them are really wonderful, aren't they?

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    You must have heard about jogging(慢跑)as a popular way of keeping fit, but what about plogging? Plogging is a mix of jogging and picking up litter, coming from the Swedish phrase "plocka upp". It started as an organized activity in Sweden around 2016 and then spread to other countries step by step. For exercising, plogging is much better than simply running, because it provides changes in body movements by adding bending(弯曲), squatting(蹲) and stretching(伸展).

    As 2018's hottest fitness way, plogging has become popular in more than 40 countries, from the US to France and Australia to Thailand. The idea of plogging is to pay attention to environmental protection as well as physical health — to care for Mother Nature as well as your body. "I run a lot and I love to spend time in nature. When I find litter out in the woods, it makes me sad and a bit angry. Plogging is a natural way to do something about that," Tesch said." It's so easy to just pick up the litter and put it in the nearest bin, and it makes you feel that you're making a difference!"

    Have you noticed people jogging while carrying trash bags recently? Or running along with hands full of dirty plastic bottles? You might do soon! Because plogging has reached China. Olivier, a Frenchman married to a Chinese girl, began promoting(促进)plogging in Huizhou, Guangdong Province, back in April. He and his wife were the only ones doing it at first, he said, but the craze soon caught on. The couple have set up a WeChat group for people to learn more about plogging. Currently there are more than 100 people from different parts of the country in the group to take an active part in the environmental movement. In honor of World Environment Day this year, the Industrial and Commercial Bank of China(中国工商银行)started plogging campaigns (运动)in 280 cities, attracting 13,000 people to join in.

    Plogging can be done almost anytime and anywhere, and costs almost nothing. Will you take it up?

    Don't be too surprised if you see a car going down the road without a driver in Beijing these days. {#blank#}1{#/blank#}Last month, Baidu began to test its self-driving cars on open roads in Beijing.

    {#blank#}2{#/blank#}Since then, companies like Tesla, Uber and Baidu have been working to produce and test their own self—driving cars.

    Self-driving cars are safer than regular cars. {#blank#}3{#/blank#}They can remove the stress of driving and allow disabled or blind people to get around more easily.

    {#blank#}4{#/blank#}In one test, researchers pointed a laser pointer (激光棒) at the car's sensors (传感器) while it was moving. The car mistakenly thought that the laser beam was in its way and slowed down or changed the direction.

    The software that is used to direct the cars may not be safe enough. {#blank#}5{#/blank#}When we use our computers or smartphones, they sometimes crash (崩溃) without any reason. But if this happened to a self-driving car, the result could be deadly. Improvements to the software could be a solution to this problem.