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.

    Mr. Green made a robot. He could say only one sentence—“There is no doubt (疑问) about it.” The robot always repeated the same words when you spoke to him.

    One day, Mr. Green needed lots of money and he took the robot to the market to sell him. “Who will buy my robot? He is very smart,” he shouted, “Twenty thousand dollars for my robot!”

    A man was surprised that he was asking for so much money. Instead of asking Mr. Green why he wanted so much money, he decided to speak to the robot. “Are you worth (值) twenty thousand dollars?” he asked the robot. “There is no double about it,” answered the robot.

    The man liked the robot's answer so much that he bought him and carried him home. But very soon he found that the robot could say nothing else. He was sorry he bought the robot. He stood in front of the robot and said, “How foolish I was to throw so much money away！”

    “There is no doubt about it,” said the robot.

    Many years ago, there was an old man who had four sons. He wanted his sons to learn not to judge(判断) things too quickly. So he told them to go and look at a pear tree. It was far away from his home.  The first, son went in winter, the second in spring, the third in summer, and the youngest son in autumn.

    When the sons came back, the old man asked them to say what they had seen.

    The first son complained the tree was ugly. The second son said the tree was covered with buds and full of hope. The third son said the tree was full of green leaves. The youngest son said that the tree, bent down with heavy fruits.

    The old man explained that all of his sons were right, but each of them had seen just one season of the tree, He told them that they couldn't judge a tree or a person by only one season. "If you give up when it's winter, you will miss the hope of your spring, the beauty of your summer, and the harvest of your autumn." said the old man.

    It is true that we shouldn't let the hard season break the happiness of other seasons. Never give up during the difficult days and better times are sure to come some day.

    "The hound(猎犬)!" cries Holmes. "Come, Watson! Come."

    We run quickly over the moor(荒野). We hear one last cry. A man is lying on the ground. As we approach(靠近) we see the dead body of Sir Henry Baskerville. He is wearing his brown suit.

    "Oh, no!" says Holmes, "This man has a beard!"

    Indeed Selden is dead instead of Sir Henry.

    "So it is all clear to me. I remember that Sir Henry gave his old suit to Barrymore, and Barrymore probably gave it to Selden—his wife's brother."

    "Then Selden is dead because of this suit," says Holmes.

    "Think, Watson! Someone gives the hound some of Sir Henry's clothes—probably the boot from the hotel in London. The hound picks up Sir Henry's scent and runs after this poor man."

    Suddenly we see Stapleton walking towards us. He says, "There was a strange noise. I was worried about Sir Henry. I wanted to check if he was all right."

    "Really?" asks Holmes.

    Stapleton looks at Holmes. "Why, it is Mr. Sherlock Holmes, the famous detective! Can you solve the mystery of the Hound of the Baskervilles?"

    Holmes shrugs his shoulders," We cannot solve every mystery. Anyway I will return to London tomorrow."

    "Oh, will you return to London tomorrow?"

    "Yes."

    So Holmes and I walk off to Baskerville Hall and Stapleton walk to his home.

    Holmes thinks Stapleton is dangerous. But we have no proof that Stapleton is the murderer.

    "There are no marks on Sir Charles's body. We know that he died of fright, but we can't prove anything."

    "Things are becoming clear to me," Holmes says to Sir Henry. "It's a very difficult case. And you must help me to catch this hound."

    We are surprised to see one portrait(画像) of a thin man is Sir Hugo, the first victim of the Hound of the Baskervilles. And he's like both Sir Henry and Stapleton. "Stapleton is a Baskerville," replies Holmes. "So he wants to inherit(继承) the Baskerville fortune, and he…," I say. It's an important clue.

    Jeff Corwin is a scientist and author. He does these jobs with one life goal: to help save animals and their habitats. His latest book, 100 Heartbeats: The Race to Save Earth's Most Endangered Species, is a collection of stories about animals on the edge(边缘) of extinction. Corwin recently talked to TFK kid reporter Sarah Horbacewicz.

Reporter: How would you describe your job?

Corwin: My job is to travel around, look at animals and tell their stories.

Reporter: When did you know this is what you wanted to do?

Corwin: I knew that when I was 6 years old. My dad was a police officer, and we lived in the city. I really enjoyed the time when I could go to the quiet countryside. The day that I saw my very first wild snake, I knew that's what I would do for the rest of my life. I didn't know if I would be a teacher or a zookeeper, but I know I would have a life connected with (与……有关) nature.

Reporter: Why did you write the book?

Corwin: We're losing species(物种) very fast. I wanted to show people that while we are in a very serious situation, we are not at the point of no return. If we make big changes, we may have the chance to save what remains.

Reporter: Is it true that humans are the reason that many of these animals are in danger?

Corwin: Human beings have a powerful effect on every other living thing. The challenge is to make that effect a positive one.