All over the world the need for more laptops and computers increases each year. Networks have been part of our life. Probably everyone with a portable device （移动设备）has once logged on to a public WiFi network without paying for it, while they are having a coffee, on a train, in a shopping mall or at a hotel. However, is this kind of public WiFi network safe?

    Some networks are better protected than others because encryption （加密）methods are used. Therefore, they are safer than others. But a survey in 2015 showed that more than 950 million records were not protected, including addresses, emails, birth dates, phone numbers, passwords and so on. These open WiFi networks are really not safe, because it is very easy for hackers （黑客） to break into the operating system and get people's private information.

    Most smartphones and laptops, by themselves, search and connect to WiFi networks. They usually prefer a network with a connection that has been used before. Hackers' devices are able to record these searches and look like the trusted WiFi networks. When these smartphones and laptops log on to the networks which are not real, hackers can easily steal their private information.

    So next time, when we want to use our laptops or our smartphones in public places which offer free WiFi networks, please think it twice or take safe measures before using them.

    How green are you ? Do you know how to be green?

    We all need a healthy environment, but we produce waste every day and it does harm to our environment. Though we are young, we can still do something to help. In fact, even the simplest everyday activities can make a real difference to the environment. Here are some ideas for you.

    Reduce

    Reduce means “use less”. Don't waste things. This saves money and reduces pollution and waste going into the environment. Before we buy something new, think whether it is really necessary—or maybe the old one will be just as good! When we do buy things, choose local products if possible, and try not to buy too many things from abroad.

    Reuse

    Reuse means “use again”. Use things for as long as possible. When we buy things, make sure that they last a long time. We should look after them so that they will last, and we should repair them if we can instead of throwing them away and buying new ones. Don't use a paper cup or a paper bag. It's better to use a china cup and a lunch box because you can use them again.

    Recycle

    Recycle means “change things into something else”. Though it takes energy(精力) to change something into something else, it's better than throwing things away or burning them. Find out what can be recycled in your neighborhood and take part in recycling programmes. We should also buy products made from recycled materials, such as recycled paper, to help save trees.

So please remember these three words： reduce, reuse and recycle.

    Computers can injure you. Most other injuries happen suddenly. For example, if you fall off a bicycle and break your arm, it happens very quickly. But computer injuries happen slowly.

Your eyes

    Too much light can injure your eyes, so never sit too close to a computer screen. Your eyes should be at least 50 centimeters from the screen. Remember to look away from it sometimes. This gives your eyes a rest.

    When you use a computer, the window should be on your left or your right. If it is behind you, the light will reflect(反射) on the screen. If the windows is in front of you, the sun and the screen will both shine into your eyes.

Your hands and wrists(手腕)

    Hand and wrist injuries can happen because the hands and wrists are moved in the same way hundreds of times. If you use a keyboard for a long times, follow these three rules:  1) Rest your wrists on something.  2) Keep your elbows at the same height as the keyboard.  3) Stop sometimes and exercise your hands, wrists and fingers in a different way.

Your back

    Some people sit for many hours in front of a computer. If you sit in a wrong way, you can injure your back or your neck. So you should sit with your back straight. The top part of the screen should be in front of your eyes. Your forearms(前臂), wrists and hands should all be parallel to(与......平衡) the floor. If you are sitting for a long time, get up every 30 minutes and exercise your arms, legs and neck.

    Enjoy your computer, but use it safely.

    "Life is speeding up. Everyone is getting unwell."

    This may sound like something someone would say today. But in fact, an unknown person who lived in Rome in AD 53 wrote it.

    We all love new inventions. They are exciting, amazing and can even change our lives.

    But have all these developments really improved the quality of our lives?

    Picture this: You're rushing to finish your homework on the computer. Your mobile phone rings, a QQ message from your friend appears on the screen, and the noise from the television is getting louder and louder. Suddenly the computer goes blank and you lose all your work. Now you have to stay up all night to get it done. How calm and happy do you feel?

    Inventions have speeded up our lives so much that they often leave us feeling stressed and tired. Why do you think people who live far away from noisy cities, who have no telephones, no cars, not even any electricity(电) often seem to be happier? Perhaps because they lead simple lives.

    Our family in the UK went "back in time" to see what life was like without all the inventions we have today. The grandparents, with their daughter, and grandsons Benjamin, 10 and Thomas, 7, spent nine weeks in a 1940s house. They had no washing machine, microwave, computer or mobile phones.

    The grandmother, Lyn, said, "It was hard physically, but not mentally." She believed life was less materialistic(物质的). "The more things you have, the more difficult life becomes," she said. The boys said they fought less. Probably, they said, because there was less to fight over, such as their computer. Also Lyn changed from being a "fashionable, beer-drinking granny, to one who cooked things."

    Here are some simple ways to beat the stress often caused by our inventions!

    Don't be available all the time. Turn off your mobile phone at certain times of the day.

    Don't check your emails every day.

    Don't reply to somebody as soon as they leave a text message just because you can. It may be fun at first, but it soon gets boring.

    Make sure you spend some time talking to your family. Set aside one evening a week when you don't turn on the television. Play cards and chat instead.

    Get a low technology hobby. Every day, do something in the old way, such as walking to have a face-to-face meeting instead of using the email or telephone.

    Don't worry too much about life—laugh more.

    As space science develops, man has learned more and more about space. Space is not only amazing but also dangerous. While working in space, spacemen are facing danger as well as success.

    Scientists have found out that radiation(辐射) is the greatest danger to spacemen in space. When spacemen are working in space, they are in danger of radiation from the sun and other stars, which is bad for their health. The damage(危害) done by radiation won't be discovered until their children or even grandchildren are born. Some special medicine may work a little, but no really helpful medicine has been.

    Space junk is also thought a great danger to spacemen. It's reported that there are 9, 000man﹣made things flying in space. About 30% of these are satellites, 10% are spaceships, and the rest are space junk. An explosion(爆炸) in 1996made a cloud of 300, 000 fragments, each at least 4mm in size, and even a small piece of these knocked against a spaceship window and did some damage. Scientists are watching and reporting any possible danger all the time. They are working on helpful ways to do with space junk.

    Although space is really dangerous, it interests everyone on the earth. In the near future, it may become usual for people to spend a few days in a space hotel. We may even choose to leave the earth and live in space in a few years. So we should care for space and do something to help improve the space environment.

Mrs. Brown goes to see her son in London. Her son works in a music club there. Mrs. Brown doesn't know London well. And she can't find her way. 

She sees a man at a bus stop. She wants to ask the man the way. "Excuse me! But can you help me please? Which bus goes to Miller's shop? "Mrs. Brown asks. The man is very friendly. He smiles. But he can't speak English. He can speak French. He is new in London. He puts his hand into his coat and takes out a small book. He opens it and reads something on it, "I am sorry. I can't speak English. "