再次请教大全32

maypurple

*PASSAGE 32 * Increasingly, historians are blaming diseases imported from the Old World for the staggering disparity between the indigenous population of America in 1492— new esti-
            mates of which soar as high as 100 million, or approxi- 5) mately 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 precipi- tous decline, and it is highly probable that the greatest 10)
            killer was epidemic disease, especially as manifested in virgin-soil epidemics. * Virgin-soil epidemics are those in which the popula- tions at risk have had no previous contact with the diseases that strike them and are therefore immunologi- 15)
            cally almost defenseless. 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 20) 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 25) 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 30) 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 35) observation. * Even so, the surviving records of North America do contain references to deadly epidemics among the indige- nous population. In 1616-1619 an epidemic, possibly of bubonic or pneumonic plague, swept coastal New 40) 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, 45) killing eight out of ten of them. * Unfortunately, the documentation of these and other epidemics is slight and frequently unreliable, and it is ecessary to supplement what little we do know with evidence from recent epidemics among Native Ameri- 50) cans. For example, in 1952 an outbreak of measles among the Native American inhabitants of Ungava Bay. Quebec, affected 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 55)
            diseases that are not normally fatal can have devastating consequences when they strike an immunologically defenseless community.

7. The author mentions the 1952 measles outbreak mostprobably in order to

 (A) demonstrate the impact of modern medicine onepidemic disease

(B) corroborate the documentary evidence of epidemicdisease in colonial America

 (C) refute allegations of unreliability made against thehistorical record of colonial America

(D) advocate new research into the continuing problemof epidemic disease

(E) challenge assumptions about how the statisticalevidence of epidemics should be interpreted

看了前辈的解释,还是不明白为什么是B ,它究竟要证实,确认什么?请NN指教啊

maypurple

NN在哪里啊

platobungee

以下是引用maypurple在2007-8-24 18:08:00的发言：

*PASSAGE 32 * Increasingly, historians are blaming diseases imported from the Old World for the staggering disparity between the indigenous population of America in 1492— new esti-
   mates of which soar as high as 100 million, or approxi- 5) mately 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 precipi- tous decline, and it is highly probable that the greatest 10)
   killer was epidemic disease, especially as manifested in virgin-soil epidemics. * Virgin-soil epidemics are those in which the popula- tions at risk have had no previous contact with the diseases that strike them and are therefore immunologi- 15)
   cally almost defenseless. 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 20) 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 25) 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 30) 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 35) observation. * Even so, the surviving records of North America do contain references to deadly epidemics among the indige- nous population. In 1616-1619 an epidemic, possibly of bubonic or pneumonic plague, swept coastal New 40) 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, 45) killing eight out of ten of them. * Unfortunately, the documentation of these and other epidemics is slight and frequently unreliable, and it is ecessary to supplement what little we do know with evidence from recent epidemics among Native Ameri- 50) cans. For example, in 1952 an outbreak of measles among the Native American inhabitants of Ungava Bay. Quebec, affected 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 55)
   diseases that are not normally fatal can have devastating consequences when they strike an immunologically defenseless community.

7. The author mentions the 1952 measles outbreak mostprobably in order to

 (A) demonstrate the impact of modern medicine onepidemic disease

(B) corroborate the documentary evidence of epidemicdisease in colonial America

 (C) refute allegations of unreliability made against thehistorical record of colonial America

(D) advocate new research into the continuing problemof epidemic disease

(E) challenge assumptions about how the statisticalevidence of epidemics should be interpreted

看了前辈的解释,还是不明白为什么是B ,它究竟要证实,确认什么?请NN指教啊

B选项中的corroborate 是我标出的原文中的supplement的一个改写，原文中我标出的句子意思是：

因为这些文献（documentation ）不可靠（unreliable），所以我们要用evidence from recent epidemics among Native Americans来补充（supplement）这个文献。下面接着就举了题目中的例子，所以例子应该正是证明这一点

所以选B

[此贴子已经被作者于2007-8-26 19:02:26编辑过]