首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
专升本
Population tends to grow at an exponential(指数的)rate. This means that they progressively double. As an example of this type of gr
Population tends to grow at an exponential(指数的)rate. This means that they progressively double. As an example of this type of gr
admin
2007-12-01
50
问题
Population tends to grow at an exponential(指数的)rate. This means that they progressively double. As an example of this type of growth rate, take one penny and double every day for one month. After the first week, you would have only 64 cents, but after the fourth week you would have over a million dollars.
This helps explain why the population has come on "all of a sudden". It took from the beginning of human life to the year 1830 for the population of the earth to reach one billion. That repents(缓慢进行)a time span of at least two million years. Then it took from 1830 to 1930 for world population to reach 2 billion. The next billion was added by 1960, only thirty years, and in 1975 world population reached 4 billion, which is another billion people in only fifteen years.
World population is increasing at a rate of 9000 per hour, 220000 per day, and 80 million per year. This is not only due to higher birth rate, but to lower death rate as well. The number of births has not declined at the same rate as the number of deaths.
Some countries, such as Columbia, Thailand, Morocco, Costa Rica, and the Philippines, are doubling their population about every twenty-one years, with a growth rate of 3.3% a year or more. The United States is doubling its population about very eighty-seven years, with a rate of 0.8% per year.
Every time a population doubles, the country involved needs twice as much of everything, including hospitals, schools, resources, food and medicines to care for its people.
It is easy to see that this is very difficult to achieve for the more rapidly growing countries.
选项
A、the growth of world population
B、one type of the exponential rate
C、the population problem of more rapidly growing countries
D、the possible ways of dealing with the rapid population growth
答案
A
解析
归纳总结题。根据前三段各段第一句 "Population tends to grow at an exponential rate", "This helps explain why the population has come On ’all of a sudden’"以及"World population is increasing at a rate of 9000 per hour, 220000 per day, and 80 million per year"可以看出,本文主要谈论世界人口的过去和现在的增长情况。最后一段以实例说明。故答案为A。
转载请注明原文地址:https://kaotiyun.com/show/HzLC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
Theyhaveequippedtheofficewiththe______businessmachines.
Heparticipatedinthereconstructionofthecity______thewarwasover.
Ifyoureallywanttoapplyforthedangerousjob,Iwon’t______,thoughIthinkit’sacrazyidea.
She______Englishsinceshewasachild.
Tofindouttheweatheroftenyearsago,counttheringsofatreetrunkfromtheoutsidetotheinside.
Duringthesummeryoushouldbeevenmorecarefulthanusualofthefoodsyou【B1】.Foods【B2】fasterinhotweatherthanincol
Itisestimatedthatabout80%oftheworld’spopulationcannotaffordtohaveproperfood,housingormedicalcare.
Alawyerfriendofminehasdevotedherselftotheserviceofhumanity.Herspecialareaiscalled"publicinterestlaw".Manyo
Onereasonisthewaytheyaretreatedoncetheygetthere.ThepeopleatDisneygooutoftheirwaytoservetheir"guests",as
Manystudentswhoparticipatedinthe2010civilserviceexams(公务员考试)inChinasawthemasthe"mostdifficult",duetotheire
随机试题
胃癌的肉眼形态是哪几型
刃磨螺纹车刀时,应达到哪些要求?
He______studied,yethepassedeveryexam.
女性,30岁,2周前有咽痛,咳嗽,发热,全身关节、肌肉酸痛2天。因心悸,气短,不能平卧住院。体检:心率120次/分,可闻及第3心音。心电图示:P-R 0.22秒,ST-T改变。胸部X线检查:心影正常。血清学检查:CK、AST增高。除了下列哪项措施外均应采用
下列关于诊断内容的说法,正确的是
温胆汤与酸枣仁汤主治证中相同的症状有
不动产权属证书记载的房屋面积是()。
期货交易成本是在期货交易过程中发生和形成的交易者必须支付的费用,主要包括()。
最早明确建立以学生学习为中心的教育心理学体系的心理学家是()。(2018年)
SaveEnergyAtHomeOntheaverage,Americanswasteasmuchenergyastwo-thirdsoftheworld’spopulationconsumes.That’slar
最新回复
(
0
)