Many great inventions(发明)have changed our lives．The first great one is still very important today-the wheel(轮子)．This invention made it easier to carry heavy things and travel long distances．

　　In the early 1800s，the world started to change．There was little unknown island left in the world．People didn't have to explore much any more．They began to work instead to make life better．

　　In the second half of the 19th century，many great inventions were made．Among them were the camera，the electric light and the radio．These all become important parts of our life today．

　　The first part of the 20th century also saw more great inventions．For instance，the helicopter(直升飞机)in 1909，sound movies in 1926，the computer in 1928 and let planes in 1930．

　　The middle part of the 20th century brought new inventions to help people get over diseases(疾病)．They worked very well．They made people healthier and live longer．

　　By this time，most people had had a very good life，but man now want to explore more．They begin to look for ways to go into space．In 1969，man took his biggest step away from earth．Americans first walked on the moon．This was just a beginning．New inventions will some day allow us to do things we have never dreamt of．

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仔细阅读下列短文, 根据题目, 选出最佳选项. What do you usually use mobile phones for Sending text messages for fun Playing games Well, mobile phones can do far more than that. During this year's Asian tsunami(海啸), mobile phones saved many lives. People were using more than 10,000 international phones when the tsunami hit. Police sent text messages to them and found more than 2,000. But how They followed the signal(信号) and found out where the tourists were. So, how can something so small be so smart Well, here's how. When you turn the phone on, it tries to find a signal. This signal comes from the telephone network. When the phone is finding a signal, it also sends a message to the telephone network. This message tells the station where the phone is. When you start to make a phone call, the telephone network tells telecommunication(电信) offices where you are. The office will find out who you're calling, then put you through to your friend. When you start to talk, a device(装置) in the phone changes your voice into electric signals. These signals travel across the telephone network and reach your friend's phone. Then his phone changes the signals into your voice again. Finally, you can hear each other!

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Jenny's mother was nearly seventy. Jenny and her husband wanted to give the old lady a nice birthday ___　1　___. She liked　___　2　___ tea, so Jenny bought an electric (电) machine. It could make the tea and then wake you up (叫醒) in the　___　3　___　. She put it in a box and brought it to her mother on her birthday. Then her mother opened the box. Jenny showed her how　___　4　___ it. “　___　5　___　you go to bed, put the tea in the pot and the water in the kettle,” she said to the old lady,“and don't forget　___　4　___ the electric on. Then, when you wake up in the morning, your tea　___　7　___ ready.”

After a few___8___, Jenny's mother ___9___ up and said, “Perhaps I'm rather silly (相当笨), but there's one thing I don't understand, why do I ___10___ go to bed to make tea?”

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