Everyone likes living in a clean and comfortable environment. If the environment(环境) are bad， it will affect our body， and make us not feel well. Sometimes we may be terribly ill. At that time we don't want to work， and we have to stay in bed and rest at home. So the environment is very important to us.

    It's germs(微生物) that makes us ill. There are germs everywhere. They are very small and you can't find them with your own eyes， but you can see them with a microscope（显微镜）They are very small and there may be hundreds of them on a very small thing， Germs can always be found in dirty water. When we look at dirty water under the microscope， we shall see them in it. Germs can also be found in air and dust（灰尘）. If you cut your finger， some of the dust from the floor may go into it， and you will have much pain in it. Sometimes the germs will go into all of your bodies， and you will have pain everywhere.

    To keep us healthy， we should try our best to make our environment cleaner and tidier. This needs us to work together.

    More and more people like bicycling and it is no surprise. It is fun, healthy and good for the environment. Maybe that's why there are 1.4 billion bicycles and only 400 million cars on roads worldwide today. Bikes can take you almost anywhere, and there is no oil cost!

    Get on a bicycle and ride around your neighbourhood. You may discover something new all around you. Stopping and getting off a bike is easier than stopping and getting out of your car. You can bike to work and benefit(受益）from the enjoyable exercise without polluting the environment. You don't even have to ride all the way.

    Folding(折叠）bikes work well for people who ride the train. Just fold the bike and take it with you. You can do the same on an airplane. A folding bike can be packed in a suitcase. You can take a common bike with you when you fly, too. But be sure to look for information by getting on airline websites. Not all airlines are bicycle-friendly to travelers.

    Health benefit of Bicycling:

    ⒈It helps to prevent heart diseases.

    ⒉Bicycling helps to control your weight.

    ⒊A15-minute bike ride to and from work three times a week burns off five kilos of fat in a year.

    ⒋Bicycling can improve(改善）your mood. Exercises like bicycling has been shown to make people feel better, more relaxed and self-confident.

    ⒌Bicycling is healthier than driving.

    Every year, the town of Verona, where the well-known love story Romeo and Juliet took place, receives thousands of letters to Juliet. These letters are written in different languages and sent from all over the world.

    The tradition of sending letters to Juliet dates back to centuries ago. At first, people left notes on a local landmark said to be Juliet's tomb（坟墓）. Later, they started to send letters to the town.

    To deal with these letters, the Juliet Club was set up in 1972.

    The staff of the Juliet Club are volunteers who call themselves “Juliet's secretary.” They can be students, couples and even grandmothers. They can read letters in many languages.

    These people take their work seriously. They use their own experiences to reply. When there is a letter difficult to reply to, they will discuss it with each other to give the best answer. Thanks to them, every letter is read, translated and answered by hand in the name of Juliet.

    The Juliet Club has been dealing with Juliet's letters for more than 40 years. You can read some of the letters on the club's official website. You can also write your own letters. Here is the address:

    Club Di Giulietta,

    Corso Santa Anastasia 29,

    37121 Verona, Italy

If you receive an e-mail that looks something like this:

    ARE YOU GOING TO CLASS TODAY? How does reading this message make you feel? Why did the sender use all capital letters(大写字母)? Was he or she angry, or did that person just forget to turn off the 'Cap Lock' on the computer? The fact is, this e-mail is usually the way that people shout online. Knowing when and when not to use capital letters is just one example of online etiquette(礼仪) —often called 'netiquette'. Virginia Shea's book, Netiquette, lists a basic set of dos and don'ts for communicating suitably with others on the Internet. Following are some of her suggestions.

    First, always remember that you are sending messages to a real person, not just to a computer. Don't type anything that you wouldn't say to someone's face. Also, remember that the person who receives your message cannot hear the tone of your voice, or see the expression on your face, so make sure your meaning is clear.

    Don't do anything online that you wouldn't do in real life. Don't take anything without paying for it, unless it's free. Don't use information that someone else has written, and say it's yours. Don't read other people's e-mail—you wouldn't open your next-door neighbor's mailbox and open their mail, right? Do share your knowledge of the Internet with others. It's a big place with lots of information, and there are many new things to discover.

    Remember that people judge(判断) you by your words as well as your actions, so try to write well. Good writing skills, as well as correct grammar and spelling, matter(有关系). Send polite, well-written e-mail messages to others. If you're uncertain about how to spell a word or which phrases to use, look it up. There are lots of helpful books and websites.

    It's okay to show your ideas online in forums(论坛) like chat room or message boards, but don't start arguments with people. 'Flame wars' in online discussions can be interesting to read, but are often unfair to other members of the group. Express your opinions, but remember that fighting online or offline is just not suitable.

    When you're online, just as in 'real' life, try to respect(尊重) other people's space, privacy and feelings. Remember, you are not the only one travelling on this highway!

    Five years is a short time in the long history of China. But as for the digital world, there are a lot of changes.

    Now we can talk easily with friends on Wechat. When shopping, we needn't carry much cash because most of the stores accept Wechat Pay and Alipay. And online shopping becomes a part of our life. For example, we can buy train and plane tickets on different apps in a minute. If we want to go somewhere, it is easy to find a Mobike as well as a sharing car on the street.

    We may not realize how these changes decide our life, but we never stopped and will not stop moving forward. China decided to set up the Xiongan New Area in Hebei Province on April 1st, 2017. It will be a smart city in China in the future. What's more, robots will play an important role in looking after the old people in five years. In an old people's home of Hangzhou, the robots called Ah Tie work quite well.

    Thanks to the developing digital world, our life is becoming better and better.

    Sleep plays an important role in our life. A lack of sleep can influence our ability to work and study.

   ①    

    Normal people need 7 to 9 hours of sleep every night. But for teenagers, a healthy amount(数量) is about 8 to 10 hours. Sadly, only of people manage that.

   ②    

    Tiredness usually reaches its highest twice a day, at 2 a.m. and 2 p.m. That explains whys students easily fall asleep in afternoon classes. So sleeping at noon for a while helps us work better in the rest of the day.

   ③    

    People can make mistakes if they don't get enough sleep. Students cannot pay attention in class or do well in sports. Drivers who have fallen asleep while driving have caused 1%﹣10% of the traffic accidents in our life. And we can imagine what will happen if a doctor feels sleepy at the operating-table!

   ④    

    There are several ways that can help us sleep better, such as avoiding drinks that make us excited late in the day, going to sleep at the same time each night, and sleeping in a comfortable place that is dark, quiet and warm.

A. Bad influences

B. Sleeping hours

C. The most tiring moments

D. Good sleeping habits