There are many kinds of 1. transportation now. Which one do you like best, by train, by bus or by plane? Now let's look at these three kinds of transportation. 2.The fastest way to travel is by plane. If you want to save time, 3.乘火车是最好的选择. A plane ticket can also be easier to book, and there are 4.(hundred) of planes leaving half an hour to everywhere. But it is much 5.(expensive) than traveling by train or by car. Many people prefer to traveling together by train. Because the train is cheaper than the plane and you can see the beautiful scenery out of the windows. But sometimes people are very noisy on the train. And it's very small and crowded inside the train. Taking a car is great. You can feel freer in your own car and you can move quickly from place to place at any time you like. 6.But sometimes you may be late because of the heavy traffic  .You have to pay for a car park and petrol . Cars are less comfortable than trains. You can't sleep or relax when you drive. Cars pollute the air more than trains, too.

    Jan Mela isn't like most kids .Two years ago , he lost an arm and a leg .But that didn't stop him.

    On Saturday ,the 15—year-old boy from Poland（波兰）walked to the North Pole（北极）without any help.

    “If I can do it, other people can do great things, too,” Mela said before he went.

    Polish newspapers said Mela is the youngest person and the first handicapped（残疾的）person to walk to the North Pole.

    How did Mela lose an arm and a leg? He had an electrical（电的）accident .Now, he walks with the help of a 62,000-yuan man-made leg.

    After the accident, Mela felt sad for himself. But he didn't lose hope .One day, he met Marek Kaminski, a Polish explorer. Eight years ago, Kaminski went to the North Pole and the South Pole in the same year. Mela wanted to see the North Pole, too. So Mela asked Kaminski if they could go together next time .Kaminski said yes!

    It took Mela 21 days to get to the North Pole .The last three or four days were really hard because of bad weather .But Mela kept going.

    “I didn't think we would make it,” he said, “Then, things got better.”

    I'm forty now. I left school twenty-two years ago. Here's my list of five things I hope to share with you teenagers at school.

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    I always wanted to be the best, and one way of feeling good about myself was to see how much better I was than others. There was only one problem with this. When I saw they were better than me, I felt terrible. Now I compare me with myself. I ask myself if I do things as well as I could.

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    How much time do you spend worrying about the future? I used to worry a lot. Now I know most things you fear will usually never happen. They're just monsters in your own mind. Even if they happen, they will often not be as bad as you expected. In six months, you probably won't remember most of the things you worry about now.

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    When I was young, I often failed to start things I expected to do because I thought they'd taken too long to finish. I always wanted to write a book, for example. But when I thought it might take me more than a year, I lost my enthusiasm(热情). It seemed such a long time. Now I know a year is nothing, if I'd started that book when I was 16, I might have written 10 more by now. I'm upset with myself for not even trying.

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    As a young child you try many new things. If you fail, you try again and again until you learn. But at school you are usually encouraged to do things right. Then you stop trying new things in case you get them wrong. You are losing chances to challenge yourselves. I always remind myself: I had fallen off the bike many times before I learned to ride it.

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    I hated losing when I was younger. Of course, it's nice to win sometimes and to be the best at something. But we can't all be winners all the time. Learning to lose is one of life's most important lessons. If you try your hardest, then you should never be angry with yourself.

I went to Grand Canyon (大峡谷) National Park in July 2012 for the first time and I knew I wanted to work there as a park ranger（管理员）. Park rangers protect the park's animals, plants, land, buildings, and people.

Now, as a park ranger for Grand Canyon National Park, I share the science, history and beauty of this park with thousands of visitors from around the world.

National parks are like outdoor museums. Park rangers have all kinds of jobs, depending on where they work and what they studied during college. I teach school field trips（实地考察）, work at visitor centers and help people stay safe during their visit.

My favorite part of my job is showing children their first look at the Grand Canyon during school field trips. Children are often amazed at the canyon's size and colors. Sometimes, they think it looks like a painting.

Being a park ranger requires a lot of energy. I walk several miles and talk with hundreds of people each day. Park rangers must enjoy working with people and speaking in front of groups. Nearly 5 million people visit Grand Canyon National Park every year.

Park rangers must also be prepared for any situation. Recently, I broke a traffic jam(堵塞). It was caused by a huge elk（麋鹿）standing in the road. Elks can become dangerous when they get scared, so I asked visitors to stop their cars and take pictures from far away. Believe it or not, I also help protect people from monkeys. It is not allowed to feed animals in national parks. But sometimes, visitors try to feed monkeys.