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
Historically, more cold-adapted antelope species originating in Eurasia have migrated into Africa, where the climate is generall
Historically, more cold-adapted antelope species originating in Eurasia have migrated into Africa, where the climate is generall
admin
2021-03-28
55
问题
Historically, more cold-adapted antelope species originating in Eurasia have migrated into Africa, where the climate is generally warmer, than have warm-adapted African species into Eurasia. A likely explanation for this involves the fact that intercontinental migrations require both a land bridge connecting the two continents and the suitable habitat both on and across that land bridge. During periods of climatic cooling, such as the various ice ages, the land bridge is open for a long time (because sea level remains low) and is usable by cold-adapt species because cool habitats then extend across it. Thus during cooling most migrants would be expected to travel toward Africa, which is near the equator, since this is the direction dictated by habitat changes on a cooling Earth. In contrast, when the Earth is warm, the land bridge is reduced or gone because sea level is relatively high then. Only during the short lag between onset of global temperature change and sea level response can warm-adapted species migrate from the equator toward higher latitudes.
According to the passage, which of the following best accounts for the apparent bias in antelope-migration direction?
选项
A、Warm-adapted antelope species are rarely able to tolerate cool habitats, whereas cold-adapted antelope species usually can tolerate warm habitats.
B、During global warming periods, land bridges, when present, lack habitats suitable for sustaining warm-adapted antelope species.
C、Under most climatic conditions, Africa offers a larger number of suitable antelope habitats than does Eurasia.
D、Many more species of antelope have originated in Eurasia than have originated in Africa.
E、Land bridges are more likely to exist when climate change favors migration to warmer climates than when climate changes favors migration to cooler climates.
答案
E
解析
“气候变化适合迁徙到温暖环境中时”指的就是全球变暖的时候,根据文章,这个时候大陆桥更可能存在。但是气候变暖时,大陆桥只会存在很短的一段时间,所以选项E正确。A项文章本身没讨论羚羊对于温度的适应性问题,而且决定羚羊往哪个方向迁徙的因素是大陆桥和大陆桥上的栖息地,而非动物的忍耐性。B项当全球变暖时,在short lag期间,大陆桥上依然有合适的栖息地。C项从文中看不出来。D项从文中看不出来。
转载请注明原文地址:https://jikaoti.com/ti/NJLYFFFM
本试题收录于:
GRE VERBAL题库GRE分类
0
GRE VERBAL
GRE
相关试题推荐
TheTricountyBridgewassupposedtorelievetrafficinEastCountwayCounty.Althoughthebridgewasopenedlastyear,traffic
Intheeighteenthcentury,Japan’sfeudaloverlords,fromtheshoguntothehumblestsamurai,foundthemselvesunderfinancials
Archaeologyasaprofessionfacestwomajorproblems.First,itisthepoorestofthepoor.Onlypaltrysumsareavailablefore
Australianresearchershavediscoveredelectroreceptors(sensoryorgansdesignedtorespondtoelectricalfields)clusteredatthe
MosteconomistsintheUnitedStatesseemcaptivatedbythespellofthefreemarket.Consequently,nothingseemsgoodornormal
4.Eoundincaveswiththebonesofaustralopithecines,whicharcthoughtbysometobeancientancestorsofthehumanspecies,
TheVolunteersforLiteracyProgramwouldbenefitifDolorestakesVictor’splaceasdirector,sinceDoloresisfarmoreskillf
Onceconsumersrecognizethataperiodofinflationhasbegun,thereisgenerallyanincreaseinconsumerspending.Thisincreas
Intendedprimarilytostimulatefamilysummertravel,thenewairfare,whichallowsbothanadultandachildtoflyforthepri
ThelargepopulationsandimpressiveculturalachievementsoftheAztecs,theMayas,andtheIncascouldnothavecomeaboutwit
随机试题
如何认识近代中国半殖民地半封建社会的基本特征?
功能失调性子官出血是指
再生障碍性贫血属于
关于狂犬病病毒的叙述,不正确的是
可摘局部义齿解剖式人工牙的牙尖斜度大约是
某急腹症的患者,病情平稳,可采用如图所示哪种卧位
如果在一个CPU周期中要产生3个脉冲T1=200ns,T2=400ns,T3=200ns,试画出时序产生器逻辑图。
简评出声思维法的优缺点。
保险最基本的职能是()。
简述投放危险物质罪与污染环境罪的区别。
最新回复
(
0
)