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    Body language is one of the most powerful means of communication, often even more powerful than spoken language. People around the world show all kinds of feelings, wishes and attitudes that they might never speak aloud. It is possible to ―read‖ others around us, even if they do not want us to catch their unspoken communication. Of course, body language can be misread, but many gestures and actions are common.

    The most common facial expression is, of course, the smile – its function is to show happiness and put people at ease. It does not always mean that we are truly happy, however. Smiles around the world can be false, hiding other feelings like anger, fear or worry. There are unhappy smiles, such as when someone ―loses face‖ and smiles to hide it. However, the general purpose of smiling is to show good feelings.

From the time we are babies, we show unhappiness or anger by frowning (皱眉头). In most places around the world, frowning and turning one's back to someone shows anger. Making a fist (拳头) and shaking it almost always means that someone is angry.

How about showing that I am bored? Looking away from people or yawning will, in most cases, make me appear to be uninterested. However, if I turn toward and look at someone or something, people from almost every culture will think that I am interested.

    Being respectful to people is subjective, based on each culture, but in general it is probably not a good idea to give a hug to boss or teacher. In almost every culture, it is not usually good to stand too close to someone of a higher rank (等级). Standing at a little distance with open hands will show that I am willing to listen.

    With so many cultural differences between people, it is great to have some similarities in body language. We can often be wrong about each other, so it is an amazing thing that we understand each other as well as we do!

    Traveling（旅行) is one of the most important activities and people were interested in it many years ago. Modern traffic develops(发展) fast, so traveling to different places has become much faster than before.Staying healthy while traveling can make your trip happier. But do you know how to keep healthyduring a trip? The following advice may be useful to you.

    Before leaving

①Wear comfortable shoes, a hat and sunglasses.

②Take some medicine that you need with you. They can be used when you get ill or have other problems.

③Do some exercise for weeks or months before you leave if you plan to do lots of walking or climbing during your trip.

④Prepare（准备） proper (适当的)food. Take bread, biscuits and some fruit for a long time. They don't go bad quickly. Bring meat, fish, eggs, milk and even salads and vegetables for a nearer one.

While traveling

①Be sure not to eat dirty food or bad fruit.

②Have enough time to take a rest during your trip.Itcan help you become more relaxed.

③Tap（水龙头）water is not safe, so drink bottled water and always clean the cover of the bottle.

④Keep food in good condition（状态）. Remember: If you travel with food, keep hot food hot and cold food cold.

    The sea looks very beautiful when the sun 1 on it. It can be very terrible when there is a 2 wind.

    The sea is very 3. It covers three quarters(3/4) of the earth. The sea is also very 4 in some places. There is one place, the sea is about 11 kilometers deep there. 5 mountain in the world is about 9 kilometers high. If that mountain was 6 the sea at that place, there would be still 2 kilometers of water 7 it!

    In most parts of the sea, there are 8 fishes and plants. Some live near the top of the sea. Others live deep down. There are also a lot of small living things. Lots of fishes live by 9 them.

    The sea can be very 10. When people go down, the sea becomes colder and colder. Only some men can go down into the deep sea. But, in 1970, five women scientists lived in the deep sea for fourteen days.

    The Vieira family moved to the United States in 1981. At that time, they decided to stop speaking Spanish at home and only speak English.  This was because they were now living in an English-speaking country.

    Now the Vieira children are adults, and they sometimes travel to Spain to visit their family and friends. But they can't communicate with them. Unfortunately this is common. When people move to new countries, they often leave their own customs and mother language behind. This is a mistake because there are many benefits to knowing more than one language.

    One advantage of speaking more than one language is that you can communicate directly with more people around the world. You do not have to depend on others to talk for you, so you're more independent (独立). People who know only one language must use others to help them communicate.

    Furthermore, speaking a second language also allows people to experience other cultures and customs more effectively. Local expressions, vocabulary, and even jokes can have a powerful effect on a person's understanding of another culture. So, knowing more than one language increases your knowledge of other cultures.

    Finally, having more multi-language speakers improves relationships between countries. If people from different countries can communicate well, the world can become closer. Countries will then have more respect for each other and better understand each other.

    The benefits of knowing more than one language are clear. In fact, there are no disadvantages. It is very sad that many people don't try to learn another language. It is even worse when people let themselves forget their mother language and become silenced.

    The best way to teach your children to live a green lifestyle is to live that green lifestyle yourself. When kids see you picking up rubbish from the park, they see value(价值)in keeping public places clean Use these tips to introduce your children to green living：

    Use public transport. Use the car only when necessary; at other times, take trains and buses with your children.

    Ask for their help. Younger children often love grown-up activities. So have them carry a small bag of food waste to the bin, or let them help separate(分开)your recycling. Older children may want to take part in the activities like cleaning up the neighbourhood and organizing the daily recycling If they're not very interested, make environment-friendly activities a family-time priority (优先事项)

    _________________________ Petting farms for younger kids may help prevent(防止)farm animals from becoming something that they see only in books or on television. Many people believe that wild animals shouldn't be kept in any kind of zoos, but they do offer a valuable educational and conservation(保护)lesson. So if you want to visit a zoo, find a zoo that provides its animals with as natural an environment as possible

    In some science fiction movies, evil robots refuse to die, no matter how hard people fight back.

    Now science fiction has become science fact. For the first time, scientists have made a robot that can take a beating (挨打) and keep on going. Scientists from Cornell University made the robot, which looks like a spider with four legs.

    Until now, even the most advanced (先进的) robot was almost certain to break down when it was damaged. That is because its computer inside simply doesn't know how to make the machine work after its shape has changed.

    To deal with this problem, the scientists put eight motors (发动机) and two sensors (传感器) that read how the machine is working. They all give signals to the machine's software. Using this information, the computer can then figure out the machine's shape at any moment.

    The new technology is a big advance in robot-making, scientists say, and it's far from scary. It may someday help scientists create better artificial (假的) arms and legs and give new freedom to people who lose them. It might also help scientists understand how people and animals figure out their own sense of place in space.

    "It has been difficult to design robots that can work well when the environment changes or when it's damaged," says Olaf Sporns of Indiana University in US. "With this work, we are nearer to solving this problem."