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.

　　【语篇解读】 绘制人类基因组图，这将意味着人类消灭癌症、艾滋病的危害，延长人类寿命将成为现实。

　　5．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.

　　解析　语义理解题。从文章最后一段第一句话Once these genes are found and studied, researchers can develop new ways to attack infections(传染), and genetic diseases 可以看出科学家们完成人类基因组图的目的。

　　答案　B

　　6．Which country studied the genes most rapidly in the world?

　　A．Japan.

　　B．Germany.

　　C．The United States.

　　D．China.

　　解析　细节理解题。因为．..the leading organization for genetic research is in the United States，所以选C。

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