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 biosphere is the name biologists give to the sort of skin on the surface of this planet that is inhabitable by living organi
The biosphere is the name biologists give to the sort of skin on the surface of this planet that is inhabitable by living organi
admin
2015-01-09
20
问题
The biosphere is the name biologists give to the sort of skin on the surface of this planet that is inhabitable by living organisms. Most land creatures occupy only the interface between the atmosphere and the land;birds extend their range for a few hundred feet into the atmosphere;burrowing invertebrates(无 脊椎动物)such as earthworms may reach a few yards into the soil but rarely penetrate farther unless.it has been recently disturbed by men. Fish cover a wider range,from just beneath the surface of the sea to those depths of greater than a mile inhabited by specialized creatures. Fungi(真菌)and bacteria are plentiful in the atmosphere to a height of about half a mile,blown there by winds from the lower air. Balloon exploration of the stratosphere(同温层)as long ago as 1936 indicated that moulds and bacteria could be found at heights of several miles,recently the USA’s National Aeronautics and Space Administration has detected them,in decreasing numbers,at heights up to eighteen miles. They arc pretty sparse at such levels, about one for every two thousand cubic feet, compared with 50 to 100 per cubic foot at two to six miles(the usual altitude of jet aircraft),and they are almost certainly in an inactive state. Marine bacteria have been detected at the bottom of the deep Pacific trench,sometimes as deep as seven miles; they are certainly not inactive. Living microbes have also been obtained on land from cores of rock drilled(while prospecting for oil)at depths of as much as 1,200 feet. Thus we can say, disregarding the exploits of astronauts, that the biosphere has a maximum thickness of about twenty-five miles. Active living processes occur only within a compass of about seven miles,in the sea, on land and in the lower atmosphere, but the majority of living creatures live within a zone of a hundred feet or so. If this planet were sealed down to the size of an orange,the biosphere,at its extreme width,would occupy the thickness of the orange-colored skin,excluding the pith.
In this tiny zone of our planet takes place the multitude of chemical and biological activities that we call life. The way in which living creatures interact with each other, depend on each other or compete with each other, has fascinated thinkers since the beginning of recorded history. Living things exist in a fine balance which is often taken for granted, from a practical point of view, things could not be otherwise. Yet it is a source of continual amazement to scientists because of its intricacy and delicacy. The balance of nature is obvious most often when it is disturbed. Yet even here it can seem remarkable how quickly it readjusts itself to a new balance after a disturbance. The science of ecology—the study of the interaction of organisms with their environment—has grown up to deal with the minutiae of the balance of nature.
The writer says that ecology is primarily concerned with the____.
选项
A、freer details of the balance of nature
B、role of organisms in the environment
C、way living creatures compete with each other
D、way nature readjusts to a new balance
答案
A
解析
推理题。解题点在文章最后一句。文章提到“The science of ecology—lhe study of the interactionof organisms with their environment--has grown up to deal with the minutiae of the balance of na-ture.”可知生态学是研究生物之间相互作用的学科。处理的是生态平衡的细节,所以正确答案是A选项。
转载请注明原文地址:https://kaotiyun.com/show/VcQO777K
0
考博英语
相关试题推荐
Manyinstructorsbelievethataninformal,relaxedclassroomenvironmentis【C1】______tolearningandinnovation.Itisnotuncom
WoodrowWilson______topreserveworldpeacebysupportingtheestablishmentofanorganizationtosettleinternationaldisputes.
Noverysatisfactoryaccountofthemechanismthatcausedtheformationoftheoceanbasinshasyetbeengiven.Thetraditional
Mathematicalabilityandmusicalabilitymaynotseemonthesurfacetobeconnected,butpeoplewhohaveresearchedthesubject
Onlyinrecentyears______beguntorealizethatwilddogs,keptwithinbounds,oftendomoregoodthanharm.
HenryviewedMelissaas______;sheseemedtobeagainstanypositionregardlessofitsmerits.
Formultinationalcorporations,taxplanninghasbecomeextremelycomplexaffairs.Ithasbeenstatedthatnomultinationalcorp
Aconsiderableamountofmedicalresearchisaimedatidentifyingriskfactorsfordisease.Therationalebehindthisworkisth
Discoveriesingenetics,molecularbiologyandgenomics—allof______providesignificantbenefitsforhumanhealth—wouldnotbe
Successas______byeconomicoutputbearsnocloserelationshiptohumanachievement.
随机试题
旨在解决商标注册用的商品和服务统一分类问题的国际公约是()。
下述气胸的病理生理中哪项是最易引起循环功能衰竭()
脊柱裂属于
“医乃仁术”是指
患者,女,停经50天,尿妊娠试验阳性,恶心呕吐10天,呕吐剧烈,呕吐物中有咖啡色血样物,发热口渴,精神萎靡,尿少便秘。舌红少苔,脉细滑数无力。当首选下列何方作为基础方剂
消化性溃疡病出现细菌性痢疾出现
工程质量目标的实现需要具体的管理和技术措施,根据工程质量形成的时间阶段,工程质里管理可分为事前管理、事中管理和事后管理,质量管理的重点应放在()管理。
2013年2月,A公司和B公司共同投资设立泰昌有限责任公司(以下简称“泰昌公司”),注册资本1000万元,其中:A公司持有30%的股权,B公司持有70%的股权。2014年3月,A公司分别向C公司和D公司转让了占泰昌公司10%的股权。2015年3月
根据法律监督的分类,以下属于社会监督的有()。
______是指在批处理系统中把—批作业安排在输入设备上,然后依次读入系统进行处理而形成的。
最新回复
(
0
)