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  3. New research asks whether psychopaths are born that way, or are made so by their upbringings. That, of course, is rather a crude

New research asks whether psychopaths are born that way, or are made so by their upbringings. That, of course, is rather a crude

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问题     New research asks whether psychopaths are born that way, or are made so by their upbringings. That, of course, is rather a crude way of putting it. After decades of debate, biologists have come to understand what was blindingly obvious to most laymen—which is that rather than being shaped by nature or nurture, most behavioural traits are the result of an interaction between the two. Nevertheless, one or the other can still be the dominant factor. And the study in question suggests that in the case of psychopathy, the genetic side is very important indeed.
    Researchers have drawn their conclusion from a study of twins. The twins in question are on the books of a long-term project known as the Twins Early Development Study(TEDS), which has been following several thousand twins since their births in 1994 and 1995. Among other things, many of the twins in TEDS have been assessed both for a tendency to bad behaviour("conduct disorder", in the argot of the field)and for the display of what are referred to as callous-unemotional traits, such as a lack of feelings of guilt after doing something wrong, or not having at least one good friend. In adults, callous and unemotional traits are symptoms of psychopathy, and those who display such traits in childhood frequently keep them into adult life. The assessments were done by the children’s teachers, whom years of experience have shown are more objective and accurate than a child’s parents.
    Based on the teachers’ assessments, the researchers identified the naughtiest 10% of the individuals in their sample—in other words those with severe conduct disorder. They then subdivided these children into those with psychopathic traits and those without and asked, in each case, whether an individual’s twin showed bad behaviour, psychopathy, or both. Their analysis showed that bad behaviour without psychopathy has relatively little genetic component—less than a third. By contrast, four-fifths of the difference in behaviour between the general population and children with psychopathic traits seems to lie in the genes.
    Though the genes in question have yet to be identified, this result suggests they are too abundant to be there by chance—in other words they are being kept in the population by natural selection because psychopathic behaviour confers a selective advantage. If it does, such an advantage probably pertains only when psychopaths are in the minority(a state of affairs known to biologists as a balanced polymorphism). But it does mean that far from being an aberrant behaviour, psychopathy may be disturbingly normal.
The best title for this text might be______.
选项 A、Original Sinners
B、Laymen Know Best
C、Psychopathic Twins
D、Nature versus Nurture
答案A
解析 属主旨题。作者开门见山点出文章主旨：大部分行为特征都是先天因素和后天因素共同作用的结果，然而二者有一个是关键因素。研究表明，在精神病病症中，基因因素是非常重要的。接下来以对双胞胎的研究加以证明，进而强调基因在精神病病症中的决定作用。至此可推出“原罪”的主题。B项在文中没有根据；C项只是文中的试验对象；D项范围太大。
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