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
2018-03-26
36
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.
The writer says that ecology is primarily concerned with the______.
选项
A、finer 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
细节题。文章结尾部分,作者阐明了生态学ecology的研究对象是the minutiae of the balance of nature,句中minutiae指的是“微小的细节”,选项A中finer details与minutia相对应。
转载请注明原文地址:https://jikaoti.com/ti/VhxDFFFM
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
Severalclassesofbittercitruscompoundhavelookedpromisingasanticanceragentsinlaboratorytests.Anewstudyindicates
Despitegrowingnumbersofjoggers,CanadaFitnessSurveysacrossthecountrydemonstratethatCanadiansarelessphysicallyfit
Osteoporosisusedtobecalled"thesilentdisease"becauseitsvictimsdidn’tknowtheyhadituntilitwastoolateandthey
Thebestexerciseshouldrequirecontinuous______,ratherthanfrequentstopsandstarts.
ImakemywaydownthethreechillyblockstoanolddineronCommercialStreet.Iammeetinganewfriendforlunch.I’veneve
Biotechnologyisexpectedtobringimportantadvancesinmedicaldiagnosisandtherapy,insolvingfoodproblems,inenergysavi
Whydopeoplealwayswanttogetupanddancewhentheyhearmusic?Theusualexplanationisthatthereissomethingembeddedin
InthispartthereisanessayinChinese.Readitcarefullyandthenwriteasummaryof200wordsinEnglishontheANSWERSHEE
Thegovernmentisspendinghundredsofbillionsextendingtheelectricity______toeveryremotevillagefortheimprovementoffa
Here’syetanothertoloseweight.Heavierpeoplearemorelikelytobekilledorseriouslyinjuredincaraccidentsthanlighte
随机试题
肾小管与集合管重吸收的方式有_______和_______两种,其中葡萄糖、氨基酸、钠离子主要是_______重吸收,而尿素是_______重吸收。
动脉导管未闭,在婴幼儿期或在有肺动脉高压或合并心力衰竭时,其杂音特点是
患者男性,25岁,晨起跑步时偶遇风后全身泛发风团,色白,伴瘙痒,发无定处,成批发生,用温水清洗后皮损很快消退,口不渴,舌淡,苔白,脉浮紧。宜选用何方治疗( )。
信息管理指的是()。
( )是指义务人应权利人的要求向保险人投保自己信用的保险。
等比累进还款法通常与借款人对于自身收入状况的预期有关,如果预期未来收入呈递增趋势,则可选择()。
甲公司是一家跨国公司,主要经营化学工业产品。除此之外,还兼营制药、食品、化妆品、首饰工艺品、纺织、冶金、电子、化肥、农药、运输和旅馆业等各种行业。公司经营的区域范围也涉及多个国家和地区。为协调遍布全世界各地的分支机构,甲公司将销售、计划、财务、人事、研究与
如果提供求助者临床资料的是心理咨询人员,对这些资料应该()
下面量数中,有单位的是()。
表达式Abs(-5)+Len("ABCDE")的值是______。
最新回复
(
0
)