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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.
The author implies which of the following about measles?
选项 A、It is not usually a fatal disease.
B、It ceased to be a problem by the seventeenth century.
C、It is the disease most commonly involved in virgin-soil epidemics.
D、It was not a significant problem in Spanish colonies.
E、It affects only those who are immunologically defenseless against it.
答案A
解析 关于麻疹，文中指出：A．通常不是致命疾病。正确。最后一段在举完麻疹的例子之后说L72—77，即使非致命疾病，如果侵袭没有免疫力的人群也会引起严重后果。由此可见：麻疹通常不是致命疾病。B．不是17世纪的一个问题。不符原文L24—26的论述和举例。C．“most commonly involved”在原文推不出。D．同B，和原文所述相反。E．只侵袭无免疫力的人。从文中无法推出。
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