These days, more and more people begin to pay more attention to their health. They want to take up different kinds of sports to keep healthy. What sports should they do then?

    Tennis

    Thomas opened up a tennis room recently. To his surprise, there were much more people than he expected(预想) coming on the first day. Because no more room was available(可利用的), he had to rent(租借) another bigger room from his neighbour, but it still couldn't meet the need. "I am pleased to see so many people like playing tennis. It is a very good sport for health," said Thomas.

    Football

    Donna works in a bookstore. She often goes to play football in the middle school near the bookstore. "Although the students are having their summer holidays, to my surprise, the playground is crowded with people," said Donna.   

    Of course, there are some other sports that people can do to keep healthy. But it's certain(确定的) that people who often exercise can work better.

    I arrived in the UK last weekend to learn English. So far I have already made a few friends and had some traditional English food there. But after having three days of hamburgers, sandwiches and potatoes, I thought none could be more delicious than Chinese food , especially my favorite—huo guo. You can't imagine how excited I was when I got to know that there was going to be a free meal of hotpot to welcome the new students. On the way to the canteen, I seemed to smell huo guo in the air.

    To my surprise, when I went into the room I didn't see any of huo guo. Where was it? With many questions in my mind, I sat down to have the free meal. After talking with an English girl, I got to know that Chinese huo guo is completely different from hotpot. Chinese huo guo is written in two words—hot pot, and hotpot, one word, is a traditional English dish.

    Hotpot is made from mutton and onion. On the top are pieces of potatoes. People put it in the oven all day in a heavy pot on a low heat. It takes very little effort to prepare. You can often see it at parties in the UK because it's easy to prepare for a large number of people and is not expensive.

    Hotpot doesn't taste bad. However, I still miss huo guo—hot pot, two words!

    Alf is a big soccer fan. At school, there are lots of children playing soccer. Alf really wants to be a soccer star, but he thinks he isn't good at soccer. He feels very sad. He always thinks about how to be a great soccer player.

    One day, Alf went to watch the school soccer match on the playground with his friend. There were many students watching the match. Suddenly Alf shouted, "Look out!" He jumped up and made a very good save(救球)！

    All the soccer players and the coach cheered for him. "What a good save, Alf! You're the best!" His friend said. The soccer coach came to him and said, "Alf, come with me." Alf stood in the goal(球门) and the coach took a shot(射门). It was a good shot, and Alf saved it. Alf saved the next shot, too; and the next one. All the students cheered. Now Alf knows he is a very good goalkeeper. He is good at playing soccer.

    Everybody hates rats. But rats may soon be man's new best friends.

    What happens after an earthquake? We send in rescue (援救) dogs. Why? Because they can smell people. Dogs save lives. They help rescuers to find living people. But dogs are big and they can't get into small space. So now a new research project is using a smaller animal to save lives: the rat.

    How does it work? First, the rat is trained to smell people. When this happens, the rat's brain gives a signal. This is sent to a small radio on its back, and then the rescuers follow the radio signals. When the rat's brain activity jumps, the rescuers know that someone is alive. The rat has smelled that person.

    Although there are already robots which can do this job, rats are better. "Robots' noses don't work well when there are other smells around. Rats are good at that," says a scientist. Rats can also see in the dark. They are cheaper and quicker to train than dogs, and unlike robots, they don't need electricity.

    The "rat project" is not finished, but a scientist says, "It would be fantastic. A rat could get into space we couldn't get to and a rat would get out if it wasn't safe." Perhaps for the first time in history, people will be happy to see a rat in a building (but only after an earthquake, of course).