Once these genes are found and studied, researchers can develop new ways to attack infections(传染), 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. 答案解析：答案为B。本题为细节推理题。由第一段第二句话 “the chances genetic research provides for getting rid of diseases and prolonging human life.” 和最后一段首句 “Once these genes are found and studied, researchers can develop new ways to attack infections, and genetic diseases.” 可知，科学家绘制人类基因组图2. Which country studied the genes most rapidly in the world?

　　A. Japan.

　　B. Germany.

　　C. The United States.

　　D. China. 答案解析：答案为C。本题为细节题。由第三段首句提到的 “…the leading organization for genetic research is in the United States, …”可知，答案为C。.

　　3. Which of the following is NOT true?

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