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
The balance of nature is a very elaborate and very delicate system of checks and counterchecks. It is continually being altered
The balance of nature is a very elaborate and very delicate system of checks and counterchecks. It is continually being altered
admin
2014-04-28
26
问题
The balance of nature is a very elaborate and very delicate system of checks and counterchecks. It is continually being altered as climates change, as new organisms evolve, as animals or plants permeate 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 manifold: 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 exterminates 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.
选项
答案
自然界的平衡是一个非常微妙又异常脆弱的破坏与反破坏的体系。这种平衡随着气候的变化,新生物的进化,以 及动植物向新领域的蔓延而不停的变化着。但这种变化在以前,或者说很久以前是缓慢的,随着文明人类的到来,变 化的速度就急速地提高了:进化速度由以前几万年甚至十万年为计算单位提高到现在的以几百年甚至几十年为单位。 人类正无处不在地改变着大自然的平衡。人们有意或无意地使动植物向其他领域扩展变得更加容易。大片的土地 被覆盖上了新的各种各样的植物,或者是楼房,工厂,一堆堆的矿渣和其他人类文明的产物。人类使一些物种大规模 的灭绝,而又倾向于使另一些物种大量地繁衍。总之,人类在五千年内使地球的生物圈发生的变化远远大于大自然自 身五百万年里所发生的变化。
解析
转载请注明原文地址:https://kaotiyun.com/show/FDpO777K
0
专业英语八级
相关试题推荐
WhichoneofthefollowingstatementsistrueofWilliamFaulkner?
Beguninthelate1960sbyPentagonweaponsresearchersasasystemforeasingcommunicationbetweencomputersindisparateelec
Beguninthelate1960sbyPentagonweaponsresearchersasasystemforeasingcommunicationbetweencomputersindisparateelec
TheBritishPrimeMinister’sofficialresidenceis,No.10______StreetinLondon.
Manyarticlesandbookshavebeenwritteninrecentyearsaboutcultureinorganizations,usuallyreferredtoas"CorporateCult
Manyarticlesandbookshavebeenwritteninrecentyearsaboutcultureinorganizations,usuallyreferredtoas"CorporateCult
WhichofthefollowingisINCORRECTaboutthefloodinginAustralia?
ThenationalanthemofAustraliaisnowthetuneof______,butonregalandvice-regaloccasionsGodSavetheQueenmustbepla
ThecapitalofAustraliais
Australiaistheworld’slargestexporterof
随机试题
用分度头分度时,工件每转过每一等分时,分度头手柄应转进的转数n=30/Z为工件的等分数。()
金融资产
胎盘附着部位的子宫内膜完全修复需到产后
违反隔离原则的做法是
基本的信贷准则是()。
根据证券法律制度的规定,下列选项中,属于知悉证券交易内幕信息的知情人员的有()。
在考虑下级的晋升问题时,领导打算提升一位副处长的职务,但民主测评的结果表明,职工们对此人的评价很低。局党组决定由你找这位副处长谈话.你准备怎样与他谈话?
甲某是一瓜农,因其西瓜常被人偷,遂将剧毒有机农药洒在几个西瓜上,并做好记号。2005年4月23日,某市5名市民食用西瓜中毒死亡。经侦查表明,原来是甲某的邻居乙某顺手偷了甲某地里的几个西瓜运到城里去卖所致。本案中,甲某对5名市民的死亡所持的心理态度不属于(
(2005下监理)根据《中华人民共和国合同法》的规定,下列合同中,属于无效合同的是______。
Nextweekwe(sign)______thesalescontractwiththenewsupplier.
最新回复
(
0
)