首页
登录
职称英语
Ecologists study how millions of species share the world, rather than take o
Ecologists study how millions of species share the world, rather than take o
游客
2025-02-19
6
管理
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. [br] In the context in which it appears, “isolated" most nearly means
选项
A、completely uncontaminated
B、somewhat unusual
C、extremely rare
D、relatively inaccessible
E、strictly confined
答案
D
解析
根据文章,isolated岛屿指的是只被占领过几次的地方,因此是”不易进入的”,所以选项D正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3964277.html
相关试题推荐
55.Acertainspeciesofbirdhastwobasicvarieties,crestedandnoncrested.Th
Caterpillarsoffallspeciesproduceanidenticalhormonecalled"juvenilehormo
Hereisanewideainagriculturalweedcontrol.Ratherthantryingtoformulate
FilmProsellsmillionsofvideocassettesdirectlytoconsumersat$25apiecefor
Theskullsandpelvicbonesofsomespeciesofdinosaursharecharacteristicswi
David:Sinceattemptingtopreserveeveryspeciesthatiscurrentlyendangeredi
Onemethodofdatingtheemergenceofspeciesistocomparethegeneticmaterial
Justasplantspeciesnativetoregionswithbrowsingmammalsevolvedmanynatur
Invirtuallyalltypesoftissueineveryanimalspecies,dioxininducesthepro
Unlikemostwarblerspecies,themaleandfemaleblue-wingedwarblerareverydi
随机试题
Foryears,scientistshavebeenstudyinghowmusicaffectsthebrainandits
某办公楼全日循环管道直饮水系统的最高日直饮水量为2500L,小时变化系数为6,水
下列说法错误的是()。A.BIM的理论基础主要起源于建筑行业 B.BIM是对工
支气管哮喘病人不宜用下列哪种药物麻醉()A.地西泮 B.氯胺酮 C.依托
急性化脓性脑膜炎并发硬脑膜下积液时,以下哪项不符()A.常发生于经特效治
合成高分子防水卷材进场时必须检验的项目有()。A、可溶物含量 B、不透水性
下列货币政策中,属于间接信用指导的有:A、利率政策 B、道义劝告 C、
学习一种新材料时运用联想、假借意义,对记忆有帮助的这种方法称为( )。A.语义
自2004年1月1日起,对证券投资基金管理人运用基金买卖股票、债券的差价收入,继
流通国债是指可以在流通市场上交易的国债,它的特征是()。 A.自由转让B.
最新回复
(
0
)