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
60
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
Generally,itisonlywhenanimalsaretrappedthatthey______toviolenceinordertoescape.
YouarerequiredtowriteanessayonthetopicWhichModeofTravelDoYouLike?Youshouldwritenolessthan200wordsandba
DanisHayesraisedtheessentialparadoxandaskedhowpeoplecouldhavefoughtsohardagainstenvironmentaldegradation______
"Dimpy,"asherfriendscallher,heardaboutthehazardsofsmokinginhealthclass."Theyshowedpicturesoflungsofpeoplew
Perhapsthemostinterestingthingaboutthephenomenonoftaboobehaviorishowitcanchange【1】theyearswithinthesamesocie
Telephonessavethefeetandendlessamountsoftime.Thisisduepartlytothefactthatthetelephoneserviceissuperbhere,
Thinkaboutwhatwouldmakeyoureally,reallyhappy.Moremoney?Wrong.Smiling,well-adjustedkids?Wrongagain.Thefactisw
Inrecentyears,Israeliconsumershavegrownmoredemandingasthey’vebecomewealthierandmoreworldly-wise.Foreigntraveli
Developingapeaceful,understanding,andsupportiverelationshipbetweenparentsandchildrenisnotaneasytask.Failurescana
随机试题
从表中得知2014年1—5月该省城乡建设项目中平均项目规模为41266万元,其中:本年新开工18205万元,较上年同期的增长速度为20.6%,按照这样的增长速度计算,2015年同期开工()。
甲公司生产电器,其与乙公司订立了委托合同,由乙公司向丙公司销售甲公司所生产的电器,并且乙公司应以自己的名义与丙公司订立合同。之后,乙公司以自己的名义与丙公司订立了买卖合同,丙公司以100万元购买100台电器,但双方没有约定履行顺序。由于甲公司生产出现了问题
下列选项中不属于优质竹笋特征的是________。
公共政策评估的类型有
慢性阻塞性肺气肿病人肺功能检查可出现()。
五硬阳气虚衰证的用方是五硬寒凝血涩证的用方是
某新设立的工业因区规划建设1座规模为30000t/d的污水处理厂,收水范围包括工业园区和相距3km处的规划新农村小区。工业因区定向招商人区企业的工业废水总量15300t/d,拟收集的生活污水总量9200t/d。拟将入区企业工业废水分类收集送至污水处理厂进行
2018年10月经修改后公布的《节约能源法》规定,国家实行有利于节能和环境保护的产业政策,具体要求是()。
编写课程标准是开发课程的重要步骤,一般来讲,课程标准除了课程目标和内容标准,还应包括()。
宋朝王安石的《伤仲永》中说有一个叫方仲永的少年,5岁时就能作诗,但后来由于他父亲没有及时教育,使他到十二三岁时写的诗就不如以前了;到20岁左右,则“泯然众人矣”。“一两的遗传胜于一吨的教育”是谁提出的?()。
最新回复
(
0
)