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
2013-01-15
102
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 are 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、free 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 ofecology-the stuay of the interaction of organisms with their environment.——has grown up to deal with the minutiae of the balance of nature.”由此可知生态学是研究生物之间相互作用的学科,已成长为处理生态 平衡的细节了,所以正确答案是A选项。
转载请注明原文地址:https://kaotiyun.com/show/4z2O777K
0
考博英语
相关试题推荐
Vitaminsareorganiccompoundsnecessaryinsmallamountsinthedietforthenormalgrowthandmaintenanceoflifeofanimals,
Itisnaivetoexpectthatanysocietycanresolveallthesocialproblemsitisfacedwith______.
Theresponsetoourfinancialappeal______anythingweexpected.
Anothercommon______aboutolderpeopleisthattheyaretoooldtolearnnewskills.
EventhoughtheItalianauthoritiesmaynolonger______anyoldbankthatgetsintotrouble,thelikelihoodofgovernmentsuppo
Itistheinteraction(between)people,(ratherthan)theeventsthatoccurintheirlivesthat(are)themainfocus(of)social
Duringthepastgeneration,theAmericanmiddle-classfamilythatoncecouldcountonhardworkandfairplaytokeepitselffin
Thinkaboutwhatwouldmakeyoureally,reallyhappy.Moremoney?Wrong.Smiling,well-adjustedkids?Wrongagain.Thefactisw
Thinkaboutwhatwouldmakeyoureally,reallyhappy.Moremoney?Wrong.Smiling,well-adjustedkids?Wrongagain.Thefactisw
InatotalofsixstatesinthemiddleofAmerica,15,000assembly-lineworkersare【1】Japanesecarstogether.Theseautoworkers
随机试题
三民主义中的首要问题是()
高分子材料按特性划分包括()等。
在银行代理的信托理财产品中,产品面临的风险主要有()。
一般纳税企业委托其他单位加工材料收回后直接对外销售的,其发生的下列支出中,应计入委托加工物资成本的有()。
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()。
以下属于律宗祖庭的是()。
①引发剧烈的山崩地裂,引发大面积地震和惊天海啸,从而带来遍地浩劫②引起像温泉及间歇泉那样的地热现象③火山区的地下活动至今仍未停止④当达到超级火山爆发的限度时,其喷发力可将岩浆喷到25公里的高空⑤平时看起来水火不容的力量似乎在和谐地同时工作⑥表面休
2013年工矿仓储用地占国有建设用地供应面积的比重约为()。
干部任免:指国家机关或有任免权的部门,依照有关法律和条例的规定,在一定的权限范围内,按照规定的程序,任用干部担任一定的职务或免去干部所担任的职务。下列不属于干部任免的一项是( )。
下图为一个简单的互联网示意图。路由器Q的路由表中到达网络50.0.0.0的下一跳步IP地址可能取值为()。
最新回复
(
0
)