首页
登录
职称英语
About three hundred years ago, there were approximately half a billion peopl
About three hundred years ago, there were approximately half a billion peopl
游客
2023-12-23
61
管理
问题
About three hundred years ago, there were approximately half a billion people in the world. In the two centuries that followed the population doubled, and, by 1850, there were more than a billion people in the world. It took only 75 years for the figure to double once more. Each day the population of the world increases by about 150,000.
In former centuries the population grew slowly. Famines, wars, and epidemics, such as the plague and cholera, killed many people. Today, although the birth rate has not changed significantly, the death rate has been lowered considerably by various kinds of progress.
Machinery has made it possible to produce more and more food in vast areas, such as the plains of America and Russia. Crops have been increased almost everywhere and people are growing more and more food. Improvement in communications and transportation has made it possible to send more food from the place where it is produced to other places where it is needed. This has helped reduce the number of famines. Progress in medicine and hygiene has made it possible for people to live longer. People in Europe and North America live, on the average, twice as long as they did a hundred years ago. In other countries, too, people generally live much longer than they once did. Babies, especially, have a far better chance of growing up because of increased protection against infant diseases. However, all countries do not benefit to same degree from this progress in medicine and hygiene.
Half the world’s people live in Asia, but most of them are concentrated in the coastal regions and on the islands. The same type of populace concentration is true of other continents, although they are often far less populated. There are still vast regions of the world where very few people live: the central regions of the larger continents, mountainous areas, deserts, the far north, and tropical jungles.
During the nineteenth and twentieth centuries, migrations have taken place within certain countries: the cities with their industries have attracted people away from the country. The possibility of earning a fixed salary in a factory or office was more attractive than the possibility of staying on the farm and having one’ s work destroyed by frost, storms, or droughts. Furthermore, the development of agricultural machinery made it possible for fewer people to do the same amount of work.
Thus, at the same time that the industrial revolution made it possible to produce goods more cheaply and more quickly in factories, an agricultural revolution also took place. Instead of leaving fields empty every third year, farmers began to plant clover or some other crop that would enrich the soil. Instead of using only animal fertilizer, farmers began to use chemical fertilizers to keep the soil rich. These methods have enabled French farmers, for example, to get five times as much wheat as was obtained from the same land two centuries ago. [br] Of all the people in the world, Asia contains______.
选项
A、one-fourth
B、one-third
C、one-half
D、two-thirds
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3297591.html
相关试题推荐
Hundredsofmotorcycleridersweretrappedbytheintensestorm.[originaltext]S
Asumof$5billionwaspledgedbyChinatoincreaseAfrica’simporttoboostit
Theworldpopulationwasnomorethan5.7billionbeforetheProgrammewasenfor
Theworldpopulationwasnomorethan5.7billionbeforetheProgrammewasenfor
Theworldpopulationwasnomorethan5.7billionbeforetheProgrammewasenfor
Passage1[br][originaltext]Thereareabout7billionpeopleintheworld.
Passage1[originaltext]Thereareabout7billionpeopleintheworld.Bute
[originaltext]Aferrybelievedoverloadedwithatleasttwohundredpassengers
[originaltext]Aferrybelievedoverloadedwithatleasttwohundredpassengers
[originaltext]Aferrybelievedoverloadedwithatleasttwohundredpassengers
随机试题
Theyagreedtoleavethehillandtoremovethe______homesonSunday.A、flowing
Ifpolicymakershopetomakefasterprogressinimprovingeconomicperformanc
Languageshavebeenchangedthroughtheages.[br]Iftwospeechvarietiesaren
以下药物的特殊杂质检查方法是A.配制成50mg/ml的溶液,测定旋光度,不得过-
下列可预防器官移植的排异反应的药物是A.胸腺素 B.白细胞介素-2 C.环孢
2015年全国共建立社会捐助工作站、点和慈善超市3.0万个,比上一年减少0.2万
发行人、认股人缴纳股款或者缴付抵作股款的出资后,除()的情形外,不得抽回资本。
双子叶植物根类药材横切面上通常可见的一圈环纹是A.木栓形成层 B.皮层纤维束环
某汽车运输企业2005年4月份有营运车辆50辆,单车月产量为4万吨千米,拖运率为
普通电抗器的安装方式包括()。A、品字形布置 B、双列式布置 C、水
最新回复
(
0
)