It is 40 meters long and 6 meters wide. This must be the biggest bus you have ever seen. It can carry 1,200 to 1,400 people.

It is China's new Super Bus. It is going for a test run in Beijing at the end of this year. Some other cities are also interested in running the Super Bus. They hope it can solve traffic problems.

    The Super Bus runs along fixed tracks (固定轨道). The bus sits on top of two 2.2-meter-tall legs. The legs have wheels at one end. Small cars can drive under the bus, so the Super Bus does not take up road space.

The bus runs on electricity and solar power. It can travel up to 60 km every hour. Its creator, Song Youzhou, says it can reduce a lot of traffic jams (堵塞).

    The Super Bus can do the work of 40 buses. In that way, it can save 860 tons of fuel (燃料) every year, according to Song.

    "To build a Super Bus and its track costs less than building subways. Subways are nearly ten times more expensive to build." Song said.

    Some people worry that the Super Bus may not be safe. However, Song says there's no need for concern. The Super Bus has laser scanners (激光扫描仪) between its legs. The scanners make sure the cars keep a safe distance.

    Most of the flowers in nature are red, orange and yellow. If we have seen a black flower, it's chance in a million.

    People have made a survey to colors of more than four thousand kinds of flowers and discovered that only eight of them are black.

    As we know, sunlight is formed by seven colored lights. The wavelength of each light is also different, so the quantity(量) of heat in each light is also different. Flowers, especially their petals(花瓣), are easy to be harmed by high temperature.

    Black flowers can take in the light of all the wavelengths that make them dry up because of high temperature, so black flowers can hardly resist(抵抗) sunlight. But red, orange and yellow flowers can protect themselves from sunlight by reflecting(反射) the red light, orange light and yellow light, each of which has a large quantity of heat.

    In the past， many students practiced English with their pen friends — they sent letters to people all around the world. However， we now send emails to others and chat with people who live quite far away on the Internet.

    Here's some advice on how to succeed in your online language exchanges：

    How to start a conversation when speaking English online When you speak to somebody online， start by asking “Yes or No” questions. Use questions such as “Do you like …?” or “Can you …?” or “Have you ever …?”

    Remember your goal. You are trying to learn about the other person. Think about things you enjoy and try to find some common ground between you. And share your own experiences to show that you have similar interests. If you only ask questions， you will sound like a policeman or a policewoman!

    How to keep a conversation going “Listen” carefully. In that way， you can get to know somebody well. When you know him or her well， you will have more to talk about.

    Then ask follow-up questions. After you “listen”， use what you “hear” to learn more about that person. Use “open ended” questions， such as “What do you think of …?” or “What was the most interesting experience ...?”

    Remember some basic rules for online language exchanges.

    Be patient. Do not try to find a good friend right away.

    Be careful. Don't give any personal information on the Internet， especially your address， telephone number， and even your real name.

    As space science develops, man has learnt 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 the radiation is the greatest danger to spacemen in space. When spacemen are working in space, they are in danger of the radiation from the Sun and other stars, which is bad for their health.

    Space rubbish is also a great danger to spacemen. It's reported that there were 9,000 man-made things flying in space. About 30% of these are satellites, 10% are spaceships, and the rest space rubbish. A small piece of these can knock a spaceship window and cause some damage.

    Scientists are watching and reporting any possible danger all the time. They are working to deal with space rubbish. Although space is really dangerous, it interests many people on Earth. In the near future, it may become possible 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 do something to help improve the space environment.