gmat阅读大全新题32篇

nickynicky

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 diseases was an important factor in the precipitous（陡峭的） decline, and it is highly probable that the greatest killer was epidemic disease, especially as manifested in virgin-soil epidemics.

这篇文章第一句我如轮如何也不能理解，有没有人能帮忙解释一下

iris0327

“历史学家越来越多地将1492年美国的土著居民数量—最新估算大概有100亿，大约是那个时期的人类总数的1/6—与19世纪末数亿纯血统NA之间的数量的惊人差距归咎于从东半球进入的疾病。毫无疑问，这种慢性疾病是（人口数量）急剧下降的主要因素，并且最大的杀手很可能就是流行病，特别表现在处女地流行病上。”

楼主看是不是这个意思？

nickynicky

一语惊醒梦中人。。。非常感谢！