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
Ecologists study how millions of species share the world, rather than take on the whole planet at once; they generally focus on
Ecologists study how millions of species share the world, rather than take on the whole planet at once; they generally focus on
admin
2020-03-28
34
问题
Ecologists study how millions of species share the world, rather than take on the whole planet at once; they generally focus on a single ecosystem, be it a prairie, a tidal flat, or a sand dune. Even within those limits, they are frustrated by
porous frontiers
. As a result, ecologists have done some of their most important work on islands, nature’s own isolated laboratories, which may be colonized only a few times over the course of millions of years. On them, ecologists have figured out how the size of a given habitat determine how many species it can support. They have then applied that knowledge to the mainland, showing how fragmented ecosystems become like archipelagoes, where extinctions can strike.
It can be inferred that the term “porous frontiers" is used to refer to
选项
A、a tendency for the area of an ecosystem to shrink
B、human-caused processes that alter the character of an ecosystem
C、movement of species into an ecosystem from outside
D、variation in what the term "ecosystem" signifies
E、lack of protection for endangered habitats
答案
C
解析
根据文章可知,多孔边界和后文的isolated相反。isolated在文中指的是独立的、只被占领过几次的岛屿环境,因此那些多孔边界指的便是被多次占领并且不独立的环境,因此选项C正确。
转载请注明原文地址:https://kaotiyun.com/show/fmVO777K
本试题收录于:
GRE VERBAL题库GRE分类
0
GRE VERBAL
GRE
相关试题推荐
Whichofthefollowingbestdescribesthecontentofthepassage?Allofthefollowingareexamplesofthetypeofevidenceuse
Thequestionsinthisgrouparebasedonthecontentofapassage.Afterreadingthepassage,choosethebestanswertoeachque
TheTricountyBridgewassupposedtorelievetrafficinEastCountwayCounty.Althoughthebridgewasopenedlastyear,traffic
BetweentheeighthandeleventhcenturiesA.D.,theByzantineEmpirestagedanalmostunparalleledeconomicandculturalreviv
MilankovitchproposedintheearlytwentiethcenturythattheiceageswerecausedbyvariationsintheEarth’sorbitaroundthe
Theproperwaytoplanascientificprojectisfirsttodecideitsgoalandthentoplanthebestwaytoaccomplishthatgoal.T
Anexperimentalmicrowaveclothesdryerheatsneitherairnorcloth.Rather,itheatswateronclothes,therebysavingelectrici
Publiceducationsuffersfromwhatcanbediagnosedasthesicknessofanovergovernedsociety.Thissicknessdeniesmanyparent
ArcticdeerliveonislandsinCanada’sarcticregions.Theysearchforfoodbymovingovericefromislandtoislandduringthe
Medalsawardedtothe10highest-rankedcountriesintheWinterOlympicsinTorino,Italy,in2006wereasshown:
随机试题
躯体旋转运动时产生的眼震颤属于
不属于口外片的是
下列的表述中关于施工组织总设计的主要内容是()。
孩子们最喜欢的全园性视觉探索活动开始了,冰冰来到了编织区。在编织区的一个角落里,拉着放射状的绳子(表示蜘蛛网的中轴线),墙上挂着一些不同颜色的毛线和细包装带,贴着一张蜘蛛网的示意图。冰冰在老师的正确指导下,编成了一个漂亮的蜘蛛网。结合案例,分析幼儿
阅读下列材料,回答问题。材料一:党的十九大报告指出,改革开放之初,我们党发出了走自己的路、建设中国特色社会主义的伟大号召。从那时以来,我们党团结带领全国各族人民不懈奋斗,推动我国经济实力、科技实力、国防实力、综合国力进入世界前列,推动我国国际地位实现
【曾纪泽】中国社会科学院2014年中国近现代史真题;南京大学2018年中国近现代史真题
Whichofthefollowingstatementsistrueaccordingtowhatyouhear?
ThetransformationofjournalisminIndia—theworld’slargestdemocracyandoneofitsfastestgrowingeconomies—hasimplicati
Overtheyears,I’veheardafairnumberofslursshoutedatcampuscops.Seldomwerethey"pig"or"fascist."Farmoreoften,
Whenaconsumerfindsthatanitemsheorheboughtisfaultyordoesnotliveuptothemanufacturer’s【B1】______forit,thefir
最新回复
(
0
)