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
外语
Populations tend to grow at an exponential (指数的) rate. This means that they progressively double. As an example of this type of
Populations tend to grow at an exponential (指数的) rate. This means that they progressively double. As an example of this type of
admin
2015-12-31
20
问题
Populations tend 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 it every day for one month. After the first week you would have only 64 cents, but after the fourth week you would have over 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 represents 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 1979 world population reached 4 billion, which is another billion people in only fifteen years.
World population is increasing at a rate of 9 000 per hour, 220 000 per day, 80 million per year. This is not only due to high birth rates, but to lower death rates as well. The number of births has not declined at the same rate as the number of deaths.
Some countries, such as Colombia, Thailand, Morocco, Costa Rica, and the Philippines, are doubling their populations about every twenty-one years, with a growth rate of 3. 3 percent a year or more. The United States is doubling its population about every eighty-seven years, with a rate of 0. 8 percent 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.
This passage chiefly discusses______.
选项
A、the growth of world population in recent years
B、one type of the exponential rate
C、the population problem of the more rapidly growing countries
D、the possible ways of dealing with the rapid population growth
答案
C
解析
本题是一道文章主题类问题。问这篇文章主要是写什么的。利用浏览式阅读法通读全文主要内容和关键词句,我们可以总结出本文的主题是世界人口的快速增长问题。因此,本题的正确答案应是C“快速发展起来的国家的人口问题”。
转载请注明原文地址:https://kaotiyun.com/show/e1PO777K
0
在职攻硕英语联考
相关试题推荐
Assoonastheexamswereover,thestudentsallwenttheir______ways.
Afteryuppiesanddinkies,anewcreaturefromalandstalkstheblock.TheNYLON,anacronymlinkingNewYorkandLondon,isa
Afteryuppiesanddinkies,anewcreaturefromalandstalkstheblock.TheNYLON,anacronymlinkingNewYorkandLondon,isa
TeachersintheUnitedStatesearnlessrelativetonationalincomethantheircounter-partsinmanyindustrializedcountries,y
Theabilitytodoseveralthingsatoncehasbecomeoneofthegreatmeasuresofself-worthfor21st-centuryAmericans.Itisc
TherearespectaculardifferencesbetweenfinancialmarketsontheContinentofEuropeontheonehand,andinBritainontheot
Scholarsandstudentshavealwaysbeengreattravelers."Academicmobility"isnowoftenstatedasafundamentalnecessityfore
Populationstendtogrowatanexponential(指数的)rate.Thismeansthattheyprogressivelydouble.Asanexampleofthistypeof
Nuclearpower’sdangertohealth,safety,andevenlifeitselfcanbesummedupinoneword:radiation.Nuclearradiationha
随机试题
茶叶水溶性灰分碱度的测定中,用酚酞作为指示剂,以氢氧化钠标准溶液作为滴定剂。
视觉性语言(阅读)中枢所在的部位是()
历史唯物主义认为,杰出人物是
某工厂已在一周前对全厂职工做过健康检查,检查项目包括内科检查。肝功能、B超、血常规、心电图、胸部X线透视。在对该厂三硝基甲苯接触工人的健康检查时,还必须补充进行
产褥期的生理特点是
建设工程要进行多次性计价,各个计价文件之间的关系是( )。
黄河公司为甲公司和乙公司的母公司。2018年6月1日,甲公司将本公司生产的一批产品出售给乙公司,售价1200万元(不含增值税,下同),成本为700万元。至2018年12月31日,乙公司已对外售出该批存货的60%,售价为820万元。不考虑其他因素,2018年
如果一个孩子在听了“海因茨偷药”的故事后,认为“海因茨应该去偷药,谁让那个药剂师那么坏,便宜一点不就好了吗”,那么这个孩子所处的道德发展阶段是()。
简述德里苏丹国的统治制度。
Tofunctionwellintheworld,peopleneedagoodsenseofwheretheirbodyisinspaceandhowit’spostured.This"positionse
最新回复
(
0
)