Many animals use some kind of “language”. They use signals(信号)and the signals have meanings. For example, when a bee(蜜蜂) has found some food, it goes 1 home. It is 2 for a bee to tell 3 bees where the food is by speaking to 4, but it can do a little dancing. This tells the bees where the food is and 5 it is.

    Some animals show how they feel by making sounds. It is not difficult to 6. If a dog is angry, it barks(吠). Birds make several different sounds and 7 has its own meaning. Sometimes we humans make sounds 8. We make sounds like “Oh!” or “Ouch!” to show how we feel about something or when we 9 something on our feet.

    We humans have languages. We have words. These words have the meaning of things, actions(行动), feelings or ideas. We 10 give each other information. Writing down words, we can remember what has happened or send messages to people far away.

Some people think that they have an answer to the problems of automobile crowding and pollution in large cities. Their answer is the bicycle, or bike.

In a great many cities, hundreds of people ride bicycles to work every day. In New York City, some bike riders have even formed a group called “Bike for a Better City”. They claim that if more people rode bicycles to work there would be fewer automobiles in the downtown section of the city and therefore less dirty air from car engines.

For several years this group has been trying to get city government to help bicycle riders. For example, they want the city to paint special lanes—for bicycles only—on some of the main streets, because when bicycle riders must use the same lanes as cars, there may be accidents. “Bike for a Better City” feels that if there were special lanes, more people would use bikes.

    But no bicycle lanes have been painted yet. Not everyone thinks it is a good idea. Taxi drivers don't like the idea—they say it will slow traffic. Some store owners on the main streets don't like the idea—they say that if there is less traffic, they will have less business. And most people live too far from downtown to travel by bike.

The city government has not yet decided what to do. It wants to keep everyone happy. On weekends, Central Park—the largest open place in New York—is closed to cars, and the roads may be used by bicycles only. But “Bike for a Better City” says that this is not enough and keeps fighting to get bicycle lanes downtown. Until that happens, the safest place to bicycle may be in the park.

    Hundreds of years ago, life was much harder than it is today. People didn't have modern machines.

    There was no modern medicine 1.

    Life today2new problems. One of the biggest is pollution. Water pollution has made our rivers and lakes dirty. It kills our fish and affects (影响) our drinking water. Noise pollution makes us 3 louder and get angry much easier. Air pollution is the most serious kind of pollution. It affects 4 living thing in the world.

    Cars, planes and factories all pollute our air every day. Sometimes the pollution is5thick that it is like a quilt (被状物)over a city. This kind of quilt is called smog(烟雾).

    When you go out for a business trip or weekend, you have to 1 pack your mobile phone, laptop(手提电脑), MP3 player, camera and so on. It's wonderful for you to 2 no batteries, no chargers(充电器) and no wires.

    This is the future “wireless power”. That is 3 of passing on electricity through the air to laptops and other small electrical devices (装置) without the need of wires.  These new devices were4 the first trade products in Las Vegas at the International Consumer Electronics Show, the world's biggest trade 5 for small electrical devices.

    Experts believe this is just the 6. In a world without wires, you can use a laptop in cafes or airports 7 you put an “electricity hotspot” inside and no longer have to search for a charger form your bags. It is said that you will be able to 8 your devices in the room that has wireless power, and then they will get the power 9. If one room has wireless power, you would know that once you walk through the front door, your mobile phone starts charging up, even when it is still in your bag or pocket. You'd never need to 10 the right charger again.

    This kind of technology, named Power Bean, can turn electricity into a laser(激光), then pass it on as heat, across the room.

    The lion is one of the most fierce (凶猛的) animals in the world. Lions can be1 in Africa and India. Lions in Africa can live without water for about one month. Lions are also popular animals in the2 . Almost every zoo around the world has a few lions. It is very3 for people to tell male and female lions from each other. You can judge (判断) simply by their appearance. A male lion has mane while female lions do not have. Male lions are 4than female lions. A male lion usually weighs about 200 kilograms which is always heavier than a female lion. Both male and female lions have very 5 teeth. They can break the backs of other animals 6 Lions feed on other animals and one lion usually kills between ten and twenty large animals each year for 7it's unusual for lions to kill people. However, in 1898 two lions 8and ate over one hundred people in Kenya before they were shot by a British man named Patterson. This 9 became the subject(主题) of a 1996 Hollywood movie called The Ghost and the Darkness. Now the Indian lions are endangered. It's really necessary for us to 10 the animals, or we won't see them again. Animals are our friends. It is our obligation to protect them.

    You either have it, or you don't—a sense of direction, that is. But why is it that some people could find their way across the Sahara without a map, while others can lose themselves in the next street?

    Scientists say we're all born with a sense of direction, 1it is not properly understood how it works. One theory is that people with a good sense of direction have simply worked harder at developing it. Research being carried out at Liverpool University supports this idea and suggests that if we don't use it, we lose it.

    "Children as young as seven have the ability to find their way around." Says Jim Martland, Research Director of the project. "However, if they are not allowed out alone or are taken everywhere by car, they2develop the skills."

    Jim Martland also emphasizes that young people should be taught certain skills to 3their sense of direction. He makes the following suggestions：

    If you are using a4, turn it so it relates to the way you are facing.

    If you leave your-bike in a5place, put it near something like a big stone or a tree. Note landmarks on the route as you go away from your bike. When you return, go back along the same route.

    Simplify the way of finding your direction by using lines such as streets in a town, streams, or walls in the countryside to guide you. Count your steps so that you know6you have gone and note any landmarks such as tower blocks or hills which can help to find out where you are.

    Now you need never get lost again!