首页
登录
职称英语
The balance of nature is a very elaborate and delicate system of check and c
The balance of nature is a very elaborate and delicate system of check and c
游客
2025-03-25
27
管理
问题
The balance of nature is a very elaborate and delicate system of check and countercheck. It is continually being altered as climates change, as new organisms evolve, as animals or plants spread to new areas. But the alterations have in the past, for the most part, been slow, whereas with the arrival of civilized man, their speed has been multiplied much: from the evolutionary time-scale, where change is measured by periods of ten or a hundred thousand years, they have been transferred to the human time-scale in which centuries and even decades count.
Everywhere man is altering the balance of nature. He is facilitating the spread of plants and animals into new regions, sometimes deliberately, sometimes unconsciously. He is covering huge areas with new kinds of plants, or with houses, factories, slag heaps and other products of his civilization. He gets rid of some species on a large scale, but favors the multiplication of others. In brief, he has done more in five thousand years to alter the biological aspect of the planet than has nature in five million years.
Many of these changes which he has brought about have had unforeseen consequences. Who would have thought that the throwing away of a piece of Canadian waterweed would have caused half the waterways of Britain to be blocked for a decade? Or that provision of pot cacti for lonely settlers’ wives would have led to Eastern Australia being covered with forests of prickly pears?
Who would have predicted that the cutting down of forests on the Adriatic coast, or in parts of Central Africa, could have reduced the land to a semi-desert with the very soil washed away from the bare rock? Who would have thought that improved communications would have changed history by the spreading of disease-sleeping sickness into East Africa, measles into Ocean, AIDS around the whole world?
These are spectacular examples, but examples on a smaller scale are everywhere to be found. We made a nature sanctuary for rare birds, providing absolute security for all species ; and we may find that some common and hardy kind of birds multiplies beyond measure and drive away the rare kinds in which we are particularly interested. We see, owing to some little change brought about by civilization, the starting spread over the English countryside in hordes. We improve the yielding capacities of our cattle; and find that how they exhaust the pastures which were sufficient for less demanding stock. We gaily set about killing the carnivores that disturb our domestic animals, the hawks that eat our fowls and game-birds; and find that in so doing we are also removing the brake that restrains the multiplication of mice and other little rodents that gnaw away the farmers’ profits. [br] This passage can best be characterized as______.
选项
A、a reminiscence of times past
B、a thoughtful essay on nature’s laws
C、a lament that so many species vanished
D、an objective discussion of civilization
答案
B
解析
主旨思想题,作者在文中论述的中心就是人类通过自身的活动打破了自然平衡,为自己带来了严重后果,所以我们可以说本文是一篇关于自然法则的富有思想的文章。A“对过去的回想”,D“关于文明的客观讨论"不是本文主要内容。作者提到了大量物种的消失,但从文中并看不出作者在“哀悼”,所以C“为许多消失的物种哀悼"不合适。
转载请注明原文地址:http://tihaiku.com/zcyy/4012079.html
相关试题推荐
Thefirstmentostudythenatureofelectricitycouldnotimaginethattheirex
Whotobelieve?NokiaorEricsson?IBMorSunMicrosystems?MicrosoftorSie
Librariesformavitalpartoftheworld’ssystemsofcommunicationandeduc
Ascomputersystemsbecomeevenmoresophisticated,______themethodsofthosew
Anewelectronicannouncementsystemhasbeenintroducedinthetaxisto______pa
TheSpanishtemperamentis______fromthatofthePortuguese.A、delicateB、distant
Manycriticsofthecurrentwelfaresystemarguethatexistingwelfareregul
Manycriticsofthecurrentwelfaresystemarguethatexistingwelfareregul
Smithfailedto______forthedeficitinthecompany’sbankbalance.A、checkB、acc
Thestudentsmadeheateddiscussions______theeducationsystem.A、astoB、dueto
随机试题
Greatemployeesaredependable,diligent,greatleadersandgreatfollowers.
对突发、群发、影响较大并造成严重后果的药品不良反应组织调查、确认和处理的部门是A
举办营业性涉外或者港澳台演出,举办单位应当负责统一办理外国或者港澳台文艺表演团体
当导游带团到达机场后得知该团所乘航班取消后,他应该()A.立即将航班取消情况报告
胆管内压达到下列哪项,肝脏分泌胆汁即受抑制A、1.47kPa(150mmH20)
下列关于中药吸湿性影响因素的叙述,错误的是A.空间的温、湿度B.储存空间大小C.
不可能宏达公司和亚鹏公司都没有中标。以下哪项最为准确地表达了上述断定的意思?A.
某中外合资家电生产企业,本年销售产品取得不含税收入2500万元,会计利润600万
心室肌细胞动作电位0期去极化是由于() A.内流 B.内流和外流 C.内流
关于项目质量控制体系的说法,正确的是( )。2014 A.项目质量控制体系
最新回复
(
0
)