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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　　There are many unusual hotels around the world．In Greenland, there is a hotel made out of ice, open between April and December every year．In Turkey, there is a cave hotel with a television, furniture, and a bathroom in each room．And in Bolivia, there is the Salt Palace Hotel．

　　Thousands of years ago, the area around the Salt Palace Hotel was a large lake．But over time, all the water disappeared．Today, the area has only two small lakes and two salt deserts．

　　The larger of the two deserts, the Uyuni salt desert, is 12, 000 square kilometers．During the day, the desert is bright white because of the salt．There are no roads across the Uyuni desert, so local people must show guests the way to the hotel．

　　In the early 1990s, a man named Juan Quesada built the hotel．He cut big blocks(块)of salt from the desert and used the blocks to build it．Everything in the hotel is made out of salt：the walls, the roof, the tables, the chairs, the beds, and the hotel's bar．

　　The sun heats the walls and roof during the day．At night the desert is very cold, but the rooms stay warm．The hotel has 12 rooms．A single room costs＄40 a night, and a double room costs＄60．

　　A sign on the hotel's wall tells guests, “ Please don't lick the walls-it doesn't taste good! ”

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