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
16
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] So far as the alterations of the balance of nature are concerned, man_____.
选项
A、is somewhat more responsible than nature itself
B、plays a much greater role than nature itself
C、has done more than nature in recent years
D、is more likely to blame than nature
答案
B
解析
事实细节题,文章第二段最后一句提到,“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.”表明在对自然平衡的改变方面,人类比自然界所起的作用要大,即B项中的内容。通过这句话同样可以判断出A、C、D不正确。A中不应是somewhat,C中不应有“in recent years”,D中不应是likely,而是确实如此。
转载请注明原文地址:https://tihaiku.com/zcyy/4012077.html
相关试题推荐
Whotobelieve?NokiaorEricsson?IBMorSunMicrosystems?MicrosoftorSie
Librariesformavitalpartoftheworld’ssystemsofcommunicationandeduc
TheSpanishtemperamentis______fromthatofthePortuguese.A、delicateB、distant
Manycriticsofthecurrentwelfaresystemarguethatexistingwelfareregul
Manycriticsofthecurrentwelfaresystemarguethatexistingwelfareregul
Smithfailedto______forthedeficitinthecompany’sbankbalance.A、checkB、acc
Thebalanceofnatureisaveryelaborateanddelicatesystemofcheckandc
Thebalanceofnatureisaveryelaborateanddelicatesystemofcheckandc
Thebalanceofnatureisaveryelaborateanddelicatesystemofcheckandc
TheUScourtsystem,aspartofthefederalsystemofgovernment,ischaract
随机试题
Organicfoodisconsideredbetterthanmedicinetokeeppeoplespiritualfitness
Whydidthepaperindustryneedanewsourceoffiberintheearly180Os?[br]
Nowanation’spoliticalinfluencedependson[br][originaltext]Astandar
MynieceAliceis______inherwayoflivingandalwaysspendsmoremoneythan
求和平、促发展、谋合作是世界各国人民的共同心愿,也是不可阻挡的(irresistible)历史潮流。特别是世界多极化(multi—polarizatio
下列关于信息比率与夏普比率的说法有误的是( )。A.夏普比率数值越大,表示单位
A.果糖B.核糖C.葡萄糖D.甘露庚酮糖E.景天庚酮糖属于六碳醛糖的是
亲水亲油平衡值A.HLBB.昙点C.Krafft点D.CMCE.m.p.
某7层民用现浇钢筋混凝土框架结构,如图所示,层高均为4.0m,结构竖向层刚度无突
(2016年真题)石斛夜光丸的功能是( )。A.滋阴补肾,清肝明目 B.补益
最新回复
(
0
)