【文章內容簡介】 to test the truth of other old ideas. He built a telescope through which he could study the skies. He collected facts that proved the earth and all the other planets move around the sun.　　Today we praise Galileo and call him one of the founders of modern science. He observed things carefully and never took anything for granted. Instead, he did experiments to test and prove an idea before he was ready to accept it.　　An experiment was done on the moon in July, 1971. One of the US astronauts who made the first deep space walk on the moon dropped a hammer and a feather together. They both landed on the surface of the moon at the same time. This experiment proved that Galileo39。s theory of falling objects is true.4PENICILLIN　　If you leave a piece of bread in a warm damp place, mould will soon grow on it. When this happens, we say the bread has gone mouldy. Mould can grow on all kinds of things besides food. It grows from spores which are in the air. If the conditions are right, a spore can quickly get around and form a mould. This happens quite menly. We have all probably seen it. 　　In 1928, Sir Alexander Fleming found that mould had killed some germs he was trying to grow in his lab. If he had not noticed this, the world would have lost one of the greatest discoveries of the century. Fleming called the substance penicillin. 　　Because penicillin can kill germs, doctors use it to treat diseases. It has saved millions of lives. Scientists grow large quantities of mon mould so that they can get penicillin from it in order to make antibiotics, that is, substances that kill germs. Next time you see some mould on a piece of bread, remember that it is one of man39。s greatest friends!The Lost NecklacePlace: a park in ParisTime: a summer afternoon in 1870People: Mathilde Loisel, wife Pierre Loisel, husband(Jeanne is sitting in the park. Mathilde walks towards her, she stops and speaks to Jeanne.)Mathilde: Good afternoon, Jeanne.Jeanne : (Looking at the other woman) I’m sorry, but I don，t think I know you.Mathilde: No, you wouldn’t but many years ago you knew me well. I，m Mathilde Loisel.Jeanne : Mathilde! My old school friend. Is it possible? But yes, of course it is .Now I remember. Where have you been all these years, Mathilde? I hope you were n’t ill .Mathilde: No, Jeanne, I was n’t ill . You see here an old woman. But it’s because of hard work—ten years of hard work.Jeanne : But I don，t understand, Mathilde . There，s only one year between us 。 I’m thirtyfive and you’re thirtyfour. Can hard work change a person that much?Mathilde : Yes, it can . Years of hard work, little food, only a cold room to live in and never, never a moment to rest. That has been my life for these past ten years. Jeanne : Mathilde! I did n’t know. I’m sorry. But what happened?Mathilde: Well, I would rather not tell you.Jeanne : Oh , e, Mathilde. Surely you can tell an old friend.Mathilde: Well, …Well, it was all because of that necklace . Your necklace.Jeanne : My necklace ?Mathilde: Do you remember one afternoon ten years ago when I came to your house and borrowed a diamond necklace?Jeanne : Let me think . Ten years ago … Oh, yes, I remember. You were going to the palace with your husband, I think.Mathilde: Right. Pierre was working in a government office, and for the first time in our lives we were invited to an important ball.(The scene changes to that evening in the home of Pierre and Mathilde Loisel.)Pierre : Yes , Mathilde, we，re going to the ball, the palace ball !Mathilde: I can，t believe it!Pierre : But it，s true.Mathilde: Oh, Pierre, how wonderful! But I haven，t got a dress for the ball !Pierre : What does a new evening dress cost?Mathilde: About four hundred francs.Pierre : Four hundred ! That，s a lot of money . But perhaps, just this once, we’ll use what we have to get a new dress for you. This ball is very important to me. I was the only person in my office who was invited.Mathilde: Thank you, Pierre, you，re so kind. Oh! But there，s one other thing…Pierre : What is it, Mathilde?Mathilde: I…I have no jewelry .Pierre ：Jewelry? Do you need jewelry? Why not just a flower?Mathilde: To go to the palace with just a flower is to say “I’m poor . I haven’t got any jewelry.”Pierre : Can’t you borrow some jewelry from a friend , Mathilde ?Mathilde: Which friend ? My friends are all poor, too.Pierre : Let me think . How about Jeanne? She married well. Perhaps she has some.Mathilde: Ah, yes, Jeanne. She married a man with a lot of money. I’ll go and see her on Friday, after I get the new dress.Pierre : I，m sure she has something you can borrow.(The scene changes back to the park. Mathilde continues to tell Jeanne her story.)Mathilde: One Friday I came to see you, Jeanne. Remember?Jeanne : Yes , Mathilde, I remember.Mathilde: You were very kind. You brought out your jewelry and told me to take anything I wanted.Jeanne : (Smiling) You were like a little girl. Your eyes became so big.Mathilde: There were so many things and they were all beautiful. It was hard to choose.Jeanne : Until you saw the diamond necklace.Mathilde: Yes, and then I knew I wanted to borrow the necklace. I didn’t want anything else , only the necklace.Jeanne : I，m sure you looked beautiful that evening, Mathilde. You were always a very pretty girl.Mathilde: Perhaps in those days I was, but everything changed after that night at the palace.Jeanne : Didn’t you have a good time at the ball ?Mathilde: Yes, a very good time, but that was the last time…the last happy evening for the next ten years.Jeanne : But why , Mathilde?Mathilde: On the way home I looked down at my dress and saw that the necklace was gone. I told Pierre. We returned to the palace and looked in every room, but couldn’t find it. I never saw your necklace again, Jeanne.Jeanne : But Mathilde, you brought it