完型填空

　　David lived in a small village．His father was often ill and he had to spend much money on medicine．And when he was twenty-six, he 　　1　　 some money from his friends and 　　2　　 married．His wife was beautiful but she came from a 　　3　　 family．So she could not help him．She told her husband to find work in the town and hoped he would get enough money to pay off his debts(債)．

　　The young man could neither read nor write．Of course 　　4　　 in the town would hire a man 　　5　　 him．He had to go to 　　6　　 island to work for a farmer there．The island was small and there were only three men on it．They lived a hard life．David 　　7　　 his father and wife so much that he wanted to write to them, 　　8　　 he couldn't．Luckily, Charlie, who had been in school for five years, helped him．And then David asked the farmer to 　　9　　 the letter for him．From then on, David waited for a 　　10　　 every day．

　　About two months later, the farmer brought his wife's letter to the island．He was very 　　11　　 but he couldn't read it．He had to ask Charlie to help him again．When the farmer came out of the house, he found David 　　12　　 Charlie's mouth．The farmer was very 　　13　　 at what David was doing．“　　14　　 are you doing it for, David?”he asked．“I 　　15　　 let him read my wife's letter,”David replied．

　　Strong winds, sand in the air, poor visibility(能見(jiàn)度), we all know the characteristics(特點(diǎn))of a sandstorm．But what else do you know about them?

　　Do you know for example, that the first sandstorm of 2009 hit north China's Inn Mongolia late February?

　　Sandstorms are today a special treat of life in northern China because of desertification(沙漠化)and the retreat(退化)of northern grasslands．They usually occur(出現(xiàn)在)between February and May．

　　Fortunately, sandstorms this year should be fewer than in past years in north China, according to the National Meteorological Center(中央氣象臺(tái))．

　　And the chances of sandstorms hitting Beijing are small, because recent rain has stopped drought(旱災(zāi))．Tree planting, and other measures taken by the government, has also helped decrease the chance of sandstorm in the city．

　　Sandstorms can be dangerous．However, there are measures you can take to protect yourself from harm．

　　◆Wear a mask．Cover your nose and mouth with a mask that can keep out sand, or use a wet handkerchief．

　　◆If you are driving and the storm is far away from you, it may be possible to outrun it．If it looks like you will be caught in the storm, stop and wait it out．

　　◆Take cover．If there is no shelter, then lie down．Keep eyes, nose and mouth covered．Cover your head with your arms or a backpack to protect yourself against flying objects．

　　If you are caught in a desert sandstorm, take the following action．

　　◆Mark your direction before lying down．It is easy to get lost in a desert．

　　◆Keep plenty of water at hand．If you get lost, you need water to keep your life until you find your way or help arrives．

　　◆Stay together if traveling in a group．Lock arms if caught in a sandstorm．

　　The most useful measure would actually be to make sandstorms disappear forever．To make this goal come true, people should plant trees, and stop desertification．

　　Today, the straight-line distance between Tian'anmen Square and a desert called Tianmo in Hebei province is only about 80km．If desertification is not stopped, environmental protection experts say, it will probably not be long until Beijingers can catch a camel to work．