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　　A few minutes ago, walking back from lunch, I started to cross the street when I heard the sound of a coin dropping．It wasn’t much but, as I turned, my eyes caught the heads of several other people turning too．A woman had dropped what seemed to be a dime(十美分硬幣)．

　　The sound of a coin dropping on the street catches everybody’s attention．Whatever the coin is, no one ignores(忽視)the sound of it．It got me thinking about sounds again．

　　There are so many sounds that catch the most attention．People in New York City seldom turn to look when they hear the siren(警報(bào))of a police car or an ambulance(救護(hù)車)．

　　When I’m in New York, I’m a New Yorker．I don’t turn either．I hardly hear a siren there．

　　At home in my little town in Connecticut, it’s different．The faraway high sound of a police car, an ambulance or a fire siren brings me to my feet if I’m sitting and brings me to the window if I’m in bed．

　　It’s the quietest sounds that catch our attention most easily, not the loudest．In the middle of the night, I can hear water dropping a hundred yards away through three closed doors．I’ve been hearing little creaking(吱嘎)noises and sounds in the middle of the night for twenty-five years in our house．Why do I never hear those sounds in the daytime?

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　　Do you hope to move to another city or a foreign country?It may be interesting．But how about moving to 　　1　　 planet?A US company now has a plan：sending people to Mars 　　2　　 20 years．

　　To begin with,the company plans to send 　　3　　 people to go to Mars first．It will 　　4　　 them several months to get there．When they arrive,they will build a 　　5　　 first．

　　But Mars is not an easy place to 　　6　　．It is rocky,cold and has lots of sandstorms(沙塵暴)．Also,there is 　　7　　 air for breath．So people would have to live in a special house．They would have to 　　8　　 special clothes if they go out．

　　People will have to find 　　9　　 resources(資源),iron,water and so on．All these could help people live there…

　　Sounds interesting?You might want to go to Mars now．　　10　　 will things go well as the company hopes?We'll wait and see．

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