We can begin our discussion of“populationas global issue”with what most persons mean when they discuss“the population problem”:t

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问题 We can begin our discussion of“populationas global issue”with what most persons mean when they discuss“the population problem”:too many people on earth and a too rapid increase in the number added each year.The facts are not in dispute.It was quite right to employ the analogy that linked demographic growth to  “a long,thin powder fuse that burns steadily and haltingly untilit finally reaches the charge and explodes.”
    To understand the current situation,which is characterized by rapid increases in population,it is necessary to understand the history of populationtrends.Rapid growth is a comparatively recentphenomenon.Looking back at 8,000 years of demographic history,we find that populations have been virtually stable or growing very slightly for most of human history.For most of our ancestors,life was hard,often nasty,and very short.There was high fertility in most places,but this was usually balanced by high morality.For most of human history,it was seldom the case that one in ten persons would live past forty,while infancy and childhood were especially risky periods.Often,societies were in clear danger of extinction because death rates could extend their birth rates.Thus,the population problem throughout most of history was how to prevent extinction of the human race.
  This pattern is important to notice.Not only does it put the current problem of demographic growth into a historical perspective,but it suggests that the cause of rapid increase in population in recent years is not a sudden enthusiasm for more children,but an improvement in the conditions that traditionally have caused high mortality.
  Demographic history can be divided into two major periods:a time of long,slow growth which extended from about 8000 B
The author of the passage intends to ________ .

选项 A、warn people against the population explosion in the near future
B、compare the demographic growth pattern in the past with that after 1650
C、find out the cause for rapid increase inpopulation in recent years
D、present us a clear and complete picture of the demographic growth

答案D

解析 文章开头提到:我们可以开始“全球人口问题”的讨论,然后作者列举古今人口增长状况,进行对比,并简要分析其原因,其目的在于向读者呈现一个清晰而完整的人口增长画面。故本题选D。
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