完形填空

　　In some parts of the world there are large deserts．There are no trees and 　　1　　 water there．Travelers must take food and 　　2　　 with them．

　　The 　　3　　 animal that can walk through the desert is the camel．　　4　　 can go without food and water for a long time．And besides he can carry heavy loads．people call the 　　5　　“the ship of the desert”．

　　The camel is very big．He has one or two humps(驼峰)on his back, short ears and a long 　　6　　．

　　The camel's humps hold fat, and his stomach holds water in twelve deep pockets．　　7　　 pocket has a mouth which closes, and the food does not mix the water．When the camel 　　8　　 some water, he can get it out of the 　　9　　．The camel's food is 　　10　　 and leaves of trees．

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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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