radio on its back，and then the rescuers follow the radio signals．When the rat's brain activity jumps, the rescuers know that someone is alive．The rat has smelled that person.

　　Although there are already robots which can do this job, rats are better． Christian Linter at Cornell University-New York says, "Robots' noses don't work well when there are other smells around．Rats are good at that." Rats can also see in the dark．They are cheaper and quicker to train than dogs, and unlike robots, they don't need electricity!

　　The "rat project" is not finished, but Julie Ryan of International Rescue Corps in Scotland says, "It would be wonderful．A rat could get into spaces we couldn't get to and a rat would get out if it wasn't safe." Perhaps for the first time in history，people will be happy to see a rat in a building(but only after an earthquake, of course)．

　　文章大意：地震过后的搜救工作往往会遇到很多问题，幸存者在哪儿？怎样判断残垣断壁下是否还有生命的存在？我们知道有生命探测仪，有搜救犬，你听说过搜救鼠吗？令人厌恶的老鼠在探测生命迹象的时候却具有更多的优势，本文意在介绍搜救鼠独特的优势。

　　1．In the world earthquake capitals, rats will become man's best friends because they can __B__ .

　　A．take the place of man's rescue jobs

　　B．find the position of people alive who are trapped in buildings

　　C．serve as food for people alive who are trapped in buildings

　　D．get into small spaces

　　解析：推理判断题。根据第二段最后两句But dogs are big and they can't get into small spaces．So now a new research project is using a smaller animal to save lives: the rat.可知，地震救援中，让老鼠钻入狭小空间中去探测幸存者的位置。

　　2．From the third paragraph we know the rescuers can judge a person is alive by __C__ .

A．the noise made by the rat