Hello, everyone!  1 to Class 3. I'm your new English teacher, Mr. Yang. Now let me tell you our class  2. First, you can't be late 3 class. You must 4 on time. Second, you must bring your English books and notebooks to every 5. Third, you must   6 English during the pair work activities. If it's 7 for you, you can ask me for help. Fourth, if you have any  8, you must put up your hands(举手). You can't talk or stand up without permission（未经许可）. These are all the rules. They are good for you,  9 you must follow them. I hope we can have a good 10 every day.

    Many people are surprised when they find that the Internet was set up in the 1960s. At that time, computers were large and expensive. Computer networks didn't work well. If one computer in the network broke down, then the whole network stopped. So a few network system had to be set up. It should be good enough to be used by many different computers. If part of the network was not working, information could be sent through another part. In this way computer network system would keep on working all the time.

At first the Internet was only used by the government, but in the early 1970s, universities, hospitals and banks were allowed to use it, too. However, computers were still very expensive and the Internet was difficult to use. By the start of 1990s, computers became cheaper and easier to use. Scientists had also developed software that made "surfing" the Internet easier.

    Today it is easy to get online and it is said that millions of people use the Internet every day. Sending e-mails is more and more popular among young people. The Internet has now become one of the most important parts of people's life.

    People and animals live in the same world. We should keep the balance（平衡）b{#blank#}1{#/blank#} people and animals. If the balance is destroyed，there will be bad result to both people and animals. Wild animals are friends of people. We have to p{#blank#}2{#/blank#} them， or there will be no wild animals in the future. Now we know that there are  n{#blank#}3{#/blank#} 2，000 nature reserves(自然保护区) in China

    There is a black and white animal l{#blank#}4{#/blank#} in China. It is always known as the national treasure(国宝) of China. Everyone knows it is c{#blank#}5{#/blank#} Giant panda. Now there are f{#blank#}6{#/blank#} pandas than before. Most of them live in Sichuan and Gansu Provinces. There are also some other rare animals in China. H{#blank#}7{#/blank#}， the n{#blank#}8{#/blank#} is becoming smaller and smaller than before. So people should try t{#blank#}9{#/blank#} best to help these animals. They are in d{#blank#}10{#/blank#} of disappearing from the world.

    In today's world of modern science and medicine, a more traditional treatment is once again becoming popular -- animal friendship.

    It is now well-known that people with problems such as heart disease or cancer live longer and get better more quickly if they have pets. Keeping pets lowers blood pressure and makes people less worried. Animals are increasingly important in treating older people who have memory loss(损失) and other brain problems. These people often feel nervous and upset. Activities with animals help them improve their physical condition and also give them joy, entertainment and loving friendship.

    Here is a case that shows the benefits of animals. John was a six-year-old boy. He had no physical problems. He just refused to talk. His older cousin, Ned, had a parrot called Sally, and John used to visit it. When he arrived, Net used to say, “Hi, John!” We all know parrots copy what they hear. After a few visits, Sally began saying “Hi, John!” When John came into the room. Then, one day, John turned to the parrot and replied “Hi, Sally!” Staying with the parrot encouraged John to begin talking.

    Another use of animal helpers is in schools. In some cases, they are used to teach children to get on and share with others, and even to teach them about animals.

    If you want to know more about animal helper programs, you can get in touch with organizations like Riding for the Disabled or do a search about animals on the Internet. You don't have to be an animal trainer or a doctor to join in.

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    What was discovered by accident? The answer is penicillin (青霉素). It kills germs. By killing germs, it saves lives. Suppose you are sick. You go to a doctor. She examines you. She says you have a "staph" infection (葡萄球菌感染). She gives you some medicine. You take it. The medicine knocks out the staph. Soon you are well. Before penicillin, this would not happen. Staph was almost sure death.

    Everyone wanted a medicine. Laboratories worked day and night. They grew the staph in small dishes. Then they tried to kill it. Nothing worked.

    The laboratory dishes had covers on them. They kept things from falling into dishes. Molds (霉菌) were a big worry. They are always in the air. You can't see them. They're too small. There are thousands of different molds. Molds can make an experiment fail. That's why dishes are covered.

    Dr. Alexander Fleming was working to kill the staph germ. He worked for years. One day he took a cover off a dish. He looked inside. There was a thick growth of staph germ. There was also some mold. Then he saw something strange. Where the mold was, there was no growth of staph. This is what Fleming probably thought. "By accident, I found a mold to kill the dreaded staph."

    This is how penicillin was found. But here's the real miracle. There are thousands of kinds of molds. But only one kind can kill staph. The mold must have fallen into the dish a few days before. The cover was probably off only a few seconds. In those few seconds the right mold fell into the right dish. Another man might have thrown the dish away. But Fleming was very careful and smart. He understood what the mold did. How lucky the humans were!