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
医学
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
2015-01-26
96
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 such as earthworms may reach a few yards into the soil but rarely penetrate father 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 and bacteria are plentiful in the atmosphere to a height of about half a mile, blown there hy winds from the lower air. Balloon exploration of the stratosphere 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 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 scaled 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 for, 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.
According to the passage, the "biosphere" is the layer on the earth’s surface______.
选项
A、where the atmosphere meets the sea
B、in which birds, fish and animals would die
C、in which plant and animal life can exist
D、in which earthworms and other invertebrates can live
答案
C
解析
细节题。第一段第一句对生物圈进行了释义,指出生物圈是生物学家们对一个表层的命名,这个表层是inhabitable by living organisms(能够被活着的有机体居住),选项C的plant和animal life全面涵盖了living organisms,因此选项C正确。
转载请注明原文地址:https://www.kaotiyun.com/show/4nT3777K
本试题收录于:
医学博士外语题库考研分类
0
医学博士外语
考研
相关试题推荐
A、ThePresidentandthehospitalB、AvisittothehospitalC、PresidentAbrahamLincolnD、LincolnandawoundedsoldierD录音主要讲的是林
Youfeelgenerallydepressedandunabletoconcentrate.Your【C1】______ofdailyactivitymaychange;youfindyourself【C2】______a
ManyCanadiansenjoytheluxuryofalargeamountoflivingspace.Canadaisvast,andthehomesarelargeaccordingtothestan
Hisbehaviorwasso______thateventhemercifulpeoplecouldnotforgivehim.
A、Asearlyas659ADB、After659ADC、BeforetheRomaninvasion.D、AftertheRomaninvasion.C录音中讲到BeerhasbeendrunkinBritai
TheAmericanresearchuniversityisaremarkableinstitution,longasourceofadmirationandwonder.Theidyllic(田园诗的),wooded
Howmuchpaindoanimalsfeel?Thisisaquestionwhichhascausedendlesscontroversy.Opponentsofbiggameshooting,forexam
At9:00intheeveningonJanuary29,justasPresidentGeorgeW.BushwasabouttobeginhisfirstStateoftheUnionaddress,
随机试题
放疗病人在照射前后2h不进食,照射后静卧半小时。
下列关于制备含毒性药物散剂的说法错误的是()
根据五行相生规律,金的“母”行为
质量管理体系的理论说明是整个质量管理体系基础的总纲,它说明了()。
根据《民法通则》的规定,()可以开办个人理财业务。
甲乙丙三国企业均向中国出口某化工产品,2016年中国生产同类化工产品的企业认为进口的这一化工产品价格过低,向商务部提出了反倾销调查申请。根据对外贸易法律制度的规定,下列表述中,正确的是()。
人民警察应具备的心理素质,主要体现为()。
1892年,主张菲律宾独立统一的“菲律宾联盟”成立,其创建者是
Lotsofcreaturesalreadyreproducewithoutsex.SincethebirthofLouiseBrown,thefirsttest-tubebaby,in1978,(1)_____of
HowtoDevelopanOutlineI.ApreliminaryoutlineA.Definition:a/an(1)______listoftopicsandsubtopics(1)______covered
最新回复
(
0
)