单选题 What will it mean to know the complete human genome. Eric Lander of MIT's Whitehead Institute compares it to the discovery of the periodic table of the elements in the late 1800s. "Genomics is now providing biology's periodic table. " says Lander. "Scientists will know that every phenomenon must be explainable in terms of this measly list" which will fit on a single CD-ROM. Already researchers are extracting DNA from patients, attaching fluorescent molecules and sprinkling the sample on a glass chip whose surface is speckled with 10,000 known genes. A laser reads the fluorescence, which indicates which of the known genes on the chip are in the mystery sample from the patient. In only the last few months such "gene expression monitoring" has diagnosed a muscle tumor in a boy thought to have leukemia, and distinguished between two kinds of cancer that require very different chemotherapy. But decoding the book of life poses daunting moral dilemmas. With knowledge of our genetic code will come the power to reengineer the human species. Biologists will be able to use the genome as a parts list much as customers scour a list of china to replace broken plates and may well let prospective parents choose their unborn child's traits. Scientists have solid leads on genes for different temperaments, body builds, statures and cognitive abilities. And if anyone still believes that parents will recoil at praying God, and leave their baby's fate in the hands of nature recall that couples have already created a frenzied market in eggs from Ivy League women. Beyond the profound ethical issues are practical concerns. The easier it is to change ourselves and our children, the less society may tolerate those who do not; warns Lori Andrews of Kent College of Law. If genetic tests in uterus predict mental dullness, obesity, short stature or other undesirable traits of the moment will society disparage children whose parents let them be born with those traits? Already, Andrews finds, some nurses and doctors blame parents for bringing into the world a child whose birth defect was diagnosable before delivery; how long will it be before the same condemnation applies to cosmetic imperfections? An even greater concern is that well-intentioned choices by millions of individual parents-to-be could add up to unforeseen consequences for all of humankind. It just so happens that some disease genes also confer resistance to disease: carrying a gene for sickle cell anemia, for instance, brings resistance to malaria. Are we smart enough, and wise enough, to know how knocking out "bad" genes will affect our evolution as a species?

【正确答案】 C

【答案解析】解析：文章只表明“基因表达监测器”可用来诊断疾病，但未说可用来治疗疾病，所以A不正确；最后一段末尾说明某些致病基因可使携带者有抵抗其他疾病的能力，因此B也不正确；第2段第1句中的“daunting”(使失去勇气或信心的)表明D错误；由最后一段可以看出，基因技术的发展会使改变孩子变得容易，人们可能会对有机会改变而没被改变不利特征的孩子更加歧视。