Want to be an astronaut?Then“study hard，stay healthy and have perseverance”!

    This is what Chinese astronauts Fei Junlong and Nie Haisheng said in Hong Kong．Fei，Nie and leading engineers of Shenzhou VI visited Hong Kong from November 27 to 30，2010．

    They talked with primary，secondary and college students．Kids were interested in the astronauts' space lives．They asked questions like “Did you see the Great Wall from space?”Fei and Nie said they didn't see the Great Wall．But they felt excited when they passed over China，including Taiwan．The Taiwan Island looks very beautiful，like jade．

    Young people wanted to know how the astronauts developed(发展)their careers(职业)．“How did you decide to be astronauts when China's space industry is still at the beginning?”spoke a young woman．The astronauts said it was because of their love of flight and the need of the nation．They said their love of flight could be seen from their children's names．Nie's daughter is named Nie Tianxiang，which means“flying up high”．Fei's son is called“Fei Di”，which sounds like“Feidie”，meaning UFO．

    When some plates(板块)of the Earth move suddenly, an earthquake happens. Many earthquakes begin under the sea. Earthquakes may happen anywhere on the Earth. They often happen near the mountains.

    During an earthquake, the shakings make rocks rise suddenly and even crack(断裂) open. Houses fall down. People are killed or hurt, and sometimes the whole villages or cities are destroyed.

    Can we do something to keep ourselves safe from earthquakes? Scientists have studied earthquakes and made maps that show the “earthquake belt（带）”. In area of these belts, it's possible for earthquakes to happen. In these areas we should build strong houses to fight against earthquakes.

    In the future, Scientists will be able to tell when and where an earthquake will attack before it happens. They can also tell people what to do and how to deal with it.

    There will be a kind of new cars in the future. People will like this kind of small cars better than the big ones. The car is as small as a bike. But it can carry two people in it. Everybody can drive it easily, just like riding a bike. Even children and old people can drive them to schools or parks.

    If everyone drives such cars in the future, there will be less pollution in the air. There will be more space for all the cars in cities, and there will also be more space for people to walk in the streets.

    The little cars of the future will cost less money to buy and to drive. These little cars can go only 65 kilometers an hour, so driving will be safer. The cars of the future will be fine for going around the city, but they will not be useful for a long trip.

    This kind of cars can save a lot of gas. They will go 450 kilometers, then they have to stop for more gas. They are nice cars, aren't they?

    What does it mean to be green? "Green" is more than just a color. It also means taking special steps to protect the environment — the water, the land, and the air we breathe. Why green? Plants are green, and without them the earth wouldn't be such a lovely home for us human beings.

    Sometimes people call our society a "throwaway society". That means we are always throwing away old things and buying new ones. Many times, if you no longer need something, someone else just might need it. For example, if your brother is old enough not to play with his plastic bike, why not give it to another family who has a little kid so that they don't need to buy one? And one less large plastic toy doesn't need to be produced.

    Recycling （回收利用）has never been easier. Many organizations will pick it up right in front of your house and some towns even require （要求）it. Tell your mom or dad you want to become "Chief of Recycling" for your family. Now that you know what things you can recycle, find a place to keep them. Make sure you encourage everyone in your house to think whether things can be reused or recycled before they're thrown away.

    Almost everyone likes traveling. But next time before you travel around the world, take a look at your own backyard. Is there a place where you could plant a tree or put in a little fruit or vegetable garden? If so, get there and get your hands dirty. Then you can watch with pride as your tree takes root, and your garden plants grow into big plants full of ripe, red tomatoes or tiny, juicy blueberries. Who knew being green would taste so good?

    Do you think the people who use smart phones all the time are relaxed? A research shows that too much smart phone use in spare time can make people more stressed out.

    So what can we do in order to really take advantage of our spare time? We have collected the following activities that also take a few hours to complete, but you'll improve your health in the process (过程).

    Whether you're at home or on holiday, it's important to disconnect from the Wi-Fi. Walking in nature can do good to your health. As a professional(职业的)traveler, Samantha Brown put it in a recent passage, "I put my map in my back pocket, put down my phones and take a good, long walk. Just walk around."

    Go to bed earlier. What can help improve your mood? Extra sleep, naturally. Getting the right amount of sleep is very important to our health and studies show that we don't get enough of it.

    Read a book. And let yourself get lost in a good story. Research shows that reading can reduce(减轻) stress, keep your brain sharp and can even help you sleep better. Everyone should spend at least 30 minutes reading every day.

    Putting pen to paper is a good exercise. Try writing down your thoughts. Writing has a lot of health advantages. Besides, writing down your thoughts may even help clear your mind.