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  3. Man, so the truism goes, lives increasingly in a man-made environment. This places a special burden on human immaturity, for it

Man, so the truism goes, lives increasingly in a man-made environment. This places a special burden on human immaturity, for it

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问题   Man, so the truism goes, lives increasingly in a man-made environment. This places a special burden on human immaturity, for it is plain that adapting to such variable conditions must depend very heavily on opportunities for learning, or whatever the processes are that are operative during immaturity. It must also mean that during immaturity man must master knowledge and skills that are either stored in the gene pool or learned by direct encounter, but which are contained in the culture pool--knowledge about values and history, skills as varied as an obligatory natural language or an optional mathematical one, as mute as levers or as articulate as myth telling.
  Yet, it would be a mistake to leap to the conclusion that because human immaturity makes possible high flexibility, therefore anything is possible for the species. Human traits were selected for their survival value over a four--to five-million-year period with a great acceleration of the selection process during the last half of that period. There were crucial, irreversible changes during that final man-making period: recession of formidable dentition, 50 percent increase in brain volume, the obstetrical paradox- bipedalism and strong pelvic girdle, larger brain through a smaller birth canal--immature brain at birth, and creation of what Washburn has called a "technical-social way of life," involving tool and symbol use.
  Note, however, that hominidization consisted principally of adaptations to conditions in the Pleistocene. These preadaptations, shaped in response to earlier habitat demands, are part of man’s evolutionary inheritance. This is not to say that close beneath the skin of man is a naked ape, that civilization is only a veneer. The technical-social way of life is a deep feature of the species adaptation. But we would err if we assumed a priori that man’s inheritance placed no constraint on his power to adapt. Some of the preadaptations can be shown to be presently maladaptive. Man’s inordinate fondness for fats and sweets no longer serves his individual survival well. And the human obsession with sexuality is plainly not fitted for survival of the species now, however well it might have served to population the upper Pliocene and the Pleistocene. Nevertheless, note that the species responds typically to these challenges by technical innovation rather than by morphological or behavioral change. Contraception dissociates sexuality from reproduction. We do not, of course, know what kinds and what range of stresses are produced by successive rounds of such technical innovation. Dissociating sexuality and reproduction, for example, surely produces changes in the structure of the family, which in turn redefine the role of women, which in turn alters the authority pattern affecting the child, etc. continuing and possible acceleration change seems inherent in such adaptation. And this, of course, places and enormous pressure on man’s uses of immaturity, preparing the young for unforeseeable change-the more so if there are severe restraints imposed by human preadaptations to earlier conditions of life.  
The author mentions contraception to demonstrate that ______.
选项 A、human beings may adapt to new conditions by technological invention rather than by changing their behavior
B、sexual promiscuity is no longer an aid to the survival of the human species
C、technological innovation is a more important adaptive mechanism than either heredity or direct encounter
D、conditions during the upper Pliocene and Pleistocene eras no longer affect the course of human evolution
答案A
解析 这是有关逻辑的问题。为什么作者要提及contraception?在作者使用这字之前，他提到the species responds typically to these challenges by technical innovation rather than morphological or behavioral change。contraception是作为例证来说明观点。这样，A就是正确的答案。B可能是第二个最佳选择。作者确实提到了不受限制的性活动不再是一个有价值的adaptive mechanism，但是这不能说明他为什么要提及contraception。作者所指的contraception是人类遇到类似问题时作出的一种technical innovation的反应，因此B的内容本身是对的，但却是答非所问。C是错的，因为contraception 是 technical innovation的一个实例，但是作者并非是用它来证实technical innovation比其他的mechanism(heredity or knowledge)更为重要。D在某方面来说是对的，但对问题的内容没有针对性。
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