For the last few years，the genetic advances in the developing field of biotechnology have provides material for all kinds of work，but the developments of modern science in unlocking the secrets of the human genetic code have opened a world of possibilities for human health，as well as for the popular imagination.

　　While European and Japanese researchers are making rapid progress in decoding human DNA，the leading organization for genetic research is in the United States，which began in 1990，is “unlocking the code” of the human body to learn how to defeat fatal diseases.Already，the Human Genome Project has become widely known and praised for finding the genes connected with terrible diseases as yet，and making progress toward separating the genes that show a sign of breast cancer or AIDS.

　　Once these genes are found and studied，researchers can develop new ways to attack infections，and genetic diseases.Medical companies are very interested in mapping the human genome，as they expect to develop a lot of new drugs for these illnesses.

　　1．Why did the scientists work hard at mapping the human genome?

　　A．Because the human genome can destroy many illnesses.

　　B．Because the human genome’s completion can help them get rid of many diseases.

　　C．Because they wanted to be better known than others.

　　D．Because the human genome can provide a lot of chances of work.

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