首页
登录
职称英语
We can begin our discussion of "population as global issue" with what most pe
We can begin our discussion of "population as global issue" with what most pe
游客
2023-09-03
64
管理
问题
We can begin our discussion of "population as 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 likened demographic growth to "a long, thin powder fuse that burns steadily and haltingly until it 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 population trends. Rapid growth is a comparatively recent phenomenon. Looking back at the 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 mortality. 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 exceed their birthrates. 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 problems 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.C. till approximately 1650 A.D. In the first period of some 9,600 years, the population increased from some 8 million to 500 million in 1650. Between 1650 and 1975, the population has increased from 500 million to more than 4 billion. And the population reached 6.2 billion throughout the world by the year 2000. One way to appreciate this dramatic difference in such abstract numbers is to reduce the time frame to something that is more manageable. Between 8000 B.C. and 1650, an average of only 50,000 persons was being added annually to the world’s population. At present, this number is added every six hours. The increase is about 80,000,000 persons annually.
选项
A、statistics of human
B、surroundings study
C、accumulation of human
D、development of human
答案
A
解析
语义题。由文章第一段中的the population problem及rapid increase in the number可知,demographic的含义应该与“人口”和“数量”有关,而-graphic表示“写、画、记录的”,由此推断A(人口统计)正确。B (环境研究),C(人口的积聚),D(人类的发展),均与文意不符,故排除。
转载请注明原文地址:http://tihaiku.com/zcyy/2981775.html
相关试题推荐
Anassumptionthatunderliesmostdiscussionsofelectricfacilitysitting
Anassumptionthatunderliesmostdiscussionsofelectricfacilitysitting
Anassumptionthatunderliesmostdiscussionsofelectricfacilitysitting
Anassumptionthatunderliesmostdiscussionsofelectricfacilitysitting
GlobalWarming:Causes,EffectsandSolutionsW
GlobalWarming:Causes,EffectsandSolutionsW
Populationshave3agents,namely,abirthrate,adeathrate,andagrowthrate
Populationshave3agents,namely,abirthrate,adeathrate,andagrowthrate
Populationshave3agents,namely,abirthrate,adeathrate,andagrowthrate
Populationshave3agents,namely,abirthrate,adeathrate,andagrowthrate
随机试题
ThefilmTitanictellsaboutavery______lovestorywhichtoucheseveryspecta
Accordingtothelatestnews,______(篮球比赛不得不推迟)untilnextweek.thebasketballmat
杆件的变形通常用以下哪几个量来度量()。A.横截面处形心的横向位移 B.横截
预应力混凝土桥梁用锚具、夹具抽检批数为()。A.500件 B.1000件
利小便而实大便的理论依据是A脾主运化 B肺主通调水道 C小肠主受盛 D小肠
患者,男性,56岁,因三度房室传导阻滞入院治疗。体检发现心室率为35次/分。根据
健康教育中行为诊断的任务不包括()。A.区别引起疾病的行为与非行为因素 B.
与肺癌发病关系最密切的因素是A.职业性致病因素 B.免疫缺陷 C.长期吸烟
肾移植术后最常见的并发症也是造成患者死亡的主要原因的是A:感染 B:出血 C
一片12位ADC的最小分辨电压为1.2mV,采用四舍五入的量化方法,若输入电压为
最新回复
(
0
)