阅读下面的短文，并从下面的文本框中为本文选择恰当的段落大意。

Sports can help you keep fit and get in touch with nature. However, whether you are on the mountains, in the rivers, or on the grassland, you should know that your sport of choice might have great influence on the environment.
② Some sports are resource-hungry. Golf, as you may know, eats up not only large areas of countryside, but also tons of water. Besides, all kinds of harmful things and a lot of energy are used to keep its courses(球场)，This leads to serious environmental problems. For example, in Portugal and Spain, golf is considered to be the most important reason for water shortage(短缺）io some areas.
③ There are many environment-friendly sports. Power walking is one of them that you could do today. You don't need anything special but a good pair of shoes; and you don't have to worry about nature and your money. Simple and free, power walking -can also keep you fit. If you often walk, it will be good for your heart and bones.
④Nowadays more and more people choose to play "green sports". They play sports outdoors, in the countryside or other open spaces. There is no special things needed. And best of all, it's free.

阅读下面短文，完成相关任务。
    Microsoft has stopped providing service for Windows XP since April 8,2014. Microsoft has provided support for Windows XP for the past 12 years. The computers that use the XP system are not as safe as before.

    The "demise"(停用) of Windows XP will have the greatest influence on China because it has about 210 million XP users, who make up about 70.percent of the PC market in the world. Microsoft's decision to "kill" Windows XP, a product with hundreds of millions of users, has a certain purpose to show its strong position in the operating system market.
    At the same time, the "death" of XP has created opportunities for China's IT companies to grow and develop. China can break the monopoly(垄断)of international IT giants and protect the internet security(安全) by having information technology and a policy that encourages innovation.

    Mum and dad are two of the most important people in your life. You probably see at least one of them every day. And they influence (影响) you more than anyone else you meet in your 1ife. So if your mom loves to read, you just might grow up carrying a book wherever you go, just like she does.

    But parents do a lot more than just passing on their hobbies. Mums and dads care for（关心）their children from the minute they were born. So they are the people we should respect(尊敬) and love best. It's very important to stay close, get along, and build a strong relationship with your parents. But not every child knows how to do this. Here are some ways to help you.

    Spend time together. Don't play a computer game or watch TV, ask your mum and dad to play with you. Go outside together, or read a book out loud.

    Be kind. Little things might mean a lot to your mum or dad. You can make your parents happy with a hug (拥抱), a card, or a joke（笑话）. It's also lovely when a child cleans up his or her room without being asked. And if you try not to fight with your brothers or sisters, your parents might be very happy.

    Do your best at whatever you do. You don't have to be perfect, but when you do your best, you make your parents proud(自豪). It makes them happy to see how you're turning into a great kid. Why? Because it lets them know you're doing a good job.

    My favorite animals are swans (天鹅). They are white. They can swim very well. I think they look like beautiful girls in white dresses (连衣裙). They have a pair of wings (翅膀) and they can also fly (飞) well. I believe  (认为) they are angels (天使) from the sky (天空). They bring us love and make (使) us happy. They are always friendly to us. We can't kill them, because they are our friends. I love them!

    I also like dogs. They are not beautiful, but they are the best friends. They keep the thieves (小偷) away. Dogs have the best hearing and eyesight. They can hear (听见) in the noise (喧闹声) and see in the dark (黑暗). If we are in danger, they will help us at once (立刻). So, I love them.

    When it comes to the letter grade on your test or homework, you might notice that there is no letter E. Have you ever thought about why that is so?

    In the A, B, C, D and F grading system, the first four letters are typically considered passing grades. An F in this system simply stands for "fail". The word "fail" happens to start with the letter F, which seems to leave out the letter E.

    The first college in the US to use a letter grading system like the ones we use today is Mount Holyoke College. In 1897, they began to use the following grading scale;

    A: 95-100% (excellent)         B: 85-94% (good)      C: 76-84% (fair)

    D: 75%( nearly passed)         E: below 75% (failed)

    We can see the inclusion of E instead of F.

    Gradually, the letter grading system became more popular all over the US. However, many schools decided to drop the E grade and go straight to F. There is no evidence(证据) to really support this, but one possible explanation is that teachers were worried that some students and parents might mistake E for "excellent".

    Why do we have letter grades? Well, part of the reason is that they made grading simpler during a time of great change for schools. As the 20th century began, growing cities and an increase in immigration led to larger school classrooms. Most teachers at that time thought this new letter grading system was an easy, fair and clear way to grade students.

    Today, more and more people think that letter grades don't fully show students' learning. However, as teachers try to improve grading methods, many parents continue to prefer the letter grades they got as kids, as they are familiar and easy for parents to understand. So while they might not be perfect, the letter grades probably aren't going away any time soon.