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  3. Increasingly, historians are blaming diseases imported from the Old World for the staggering disparity between the indigenous po

Increasingly, historians are blaming diseases imported from the Old World for the staggering disparity between the indigenous po

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问题     Increasingly, historians are blaming diseases imported from the Old World for the staggering disparity between the indigenous population of America in 1492—new estimates of which soar as high as 100 million, or approximately one-sixth of the human race at that time—and the few million full-blooded Native Americans alive at the end of the nineteenth century. There is no doubt that chronic disease was an important factor in the precipitous decline, and it is highly probable that the greatest killer was epidemic dis- ease, especially as manifested in virgin-soil epidemics.
    Virgin-soil epidemics are those in which the populations at risk have had no previous contact with the diseases that strike them and are therefore immunologically almost defenselass. That virgin-soil epidemics were important in American history is strongly indicated by evidence that a number of dangerous maladies—small pox, measles, malaria, yellow fever, and undoubtedly several more—were unknown in the pre-Columbian New World. The effects of their sudden introduction are demonstrated in the early chronicles of America, which contain reports of horrendous epidemics and steep population declines, confirmed in many cases by recent quantitative analyses of Spanish tribute records and other sources. The evidence provided by the documents of British and French colonies is not as definitive because the conquerors of those areas did not establish permanent settlements and begin to keep continuous records until the seventeenth century, by which time the worst epidemics had probably already taken place. Furthermore, the British tended to drive the native populations away, rather than enslaving them as the Spaniards did, so that the epidemics of British America occurred beyond the range of colonists’ direct observation.
    Even so, the surviving records of North America do contain references to deadly epidemics among the indigenous population. In 1616-1619 an epidemic, possibly of bubonic or pneumonic plague, swept coastal New England, killing as many as nine out of ten. During the 1630’ s smallpox, the disease most fatal to the Native American people, eliminated half the population of the Huron and Iroquois confederations. In the 1820’ s fever devastated the people of the Columbia River area, killing eight out of ten of them.
    Unfortunately, the documentation of these and other epidemics is slight and frequently unreliable, and it is necessary to supplement what little we do know with evidence from recent epidemics among Native Americans. For example, in 1952 an outbreak of measles among the Native American inhabitants of Ungava Bay. Quebec, af- fected 99 percent of the population and killed 7 percent, even though some had the benefit of modern medicine. Cases such as this demonstrate that even diseases that are not normally fatal can have devastating consequences when they strike an immunologically defenseless community.
Which of the following, if newly discovered, would most seriously weaken the author’s argument concerning the importance of virgin-soil epidemics in the depopulation of Native Americans?
选项 A、Evidence setting the pre-Columbian population of the New World at only 80 million.
B、Spanish tribute records showing periodic population fluctuations.
C、Documents detailing sophisticated Native American medical procedures.
D、Fossils indicating Native American contact with smallpox prior to 1492.
E、Remains of French settlements dating back to the sixteenth century.
答案D
解析 哪一个证据如果成立，削弱了作者的主张：处女地传染病在削减美洲土著人方面起了很大的作用?作者的正式结论在L21—27：处女地传染病重要性被如下证据说明：一些危险疫病在前哥伦布时代根本不存在。∴D否定此论据，正确。化石显示，天花在1492年以前已经侵犯了美洲土著居民。A、B、C、E全和原文的推理过程毫无关系。
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