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
Hungry prehistoric hunters, not climate change, drove elephants to extinction during the Pleistocene era (更新世), new research sug
Hungry prehistoric hunters, not climate change, drove elephants to extinction during the Pleistocene era (更新世), new research sug
admin
2012-12-26
47
问题
Hungry prehistoric hunters, not climate change, drove elephants to extinction during the Pleistocene era (更新世), new research suggests.
At least 12 kinds of elephants【1】to wander about the African, Eurasian, and American continents.
Today, only two【2】of elephants are left in South Asia and Africa. One theory for this dramatic death holds that rapid climate shifts at the end of the most recent major ice age, some 10,000 years ago,【3】vegetation and broke up habitats (栖息地), causing the death of those unable to adapt to the new conditions. Another【4】blames prehistoric humans, whose improved weapons and hunting techniques allowed them to wipe out whole herds of elephants.
To help【5】the debate, archaeologist Todd Surovell of the University of Wyoming, and colleagues tested two assumptions. If humans caused the elephant extinction, Surovell reasoned, the timing of the die-off in【6】regions should match human expansion into those regions. On the contrary, if the extinction was【7】to climate change, elephants should remain in regions【8】colonized by humans and would only begin to die off once climate change occurred.
The team tested both theories by analyzing where and when elephants were killed. In all, the study included 41 archaeological sites on five continents. The researchers found that, as humans【9】out of Africa, they left a trail of dead elephants behind them. The creatures disappear from the fossil record of a region once it became colonized by humans. Modern elephants survived in refu ges【10】to humans, such as tropical forests, says Surovell.
A. uninviting B. migrated C. declined D. due
E. memorial F. specific G. already N. used
I. hypothesis J. endurance K. resolve L. polish
M. altered O. species
【2】
选项
答案
O
解析
此处需要由限定词two修饰的复数名词作句子的主语。只有species是复数名词,且与前一句中的kinds属于同义词,two species of elephants意为“两种大象”。
转载请注明原文地址:https://kaotiyun.com/show/cdw7777K
0
大学英语四级
相关试题推荐
A、TheLibraryneedsmorebooksandpaintings.B、TheLibrary’srunningcostsaregoingdown.C、Itisimpossibletogrowgrassand
A、Todosomeresearch.B、Tosupporthisfamily.C、Topayforhiscollegeeducation.D、Tohelphispartnerexpandbusiness.C选项均以
ManywithNewCollegeDegreeFindtheJobMarketHumblingTheindividualstoriesarefamiliar.Thechemistrymajortendingb
Womenareonthevergeofoutnumberingmenintheworkforceforthefirsttime,ahistoricreversalcausedbylong-termchanges
ImaginesendingelectronicmailtoyourfriendintheU.S.ordiscussingyourgardeningproblemwitha【B1】______inAustralia,or
A、ChangesinChildRearing.B、ChangesinAmericanSexRoles.C、ChangesinMen’sRolesinFamilyLife.D、ChangesinWomen’sRoles
A、Bothspeakerswererunningoutofmoney.B、Themanlentsomemoneytothewoman.C、Thewomanlentsomemoneytotheman.D、The
A、Itisbeingforcedoutoftheentertainmentindustry.B、Itshouldchangeitsconceptofoperation.C、Itshouldrevolutionizei
Chemistrydidnotemergeasascienceuntilafterthescientificrevolutionintheseventeenthcenturyandthenonlyratherslow
Ifoursocietyeverneededareadingrenaissance(复兴),it’snow.TheNationalEndowmentfortheArtsreleased"ReadingatRisk"l
随机试题
下面句中表示条件复句关系的句子是()
A.胃泌酸腺壁细胞B.胃泌酸腺主细胞C.胃窦、上段小肠的G细胞D.十二指肠、空肠黏膜内的S细胞E.十二指肠、空肠黏膜中的I细胞分泌内因子的是
()类似于建设项目环境影响评价大纲,它是环境影响评价工作的总体设计和行动指南,是编制环境影响报告书的主要技术依据,也是检查报告书内容和质量的判定标准。
根据机械性能和使用状态,可将高分子材料分为( )。
四川地貌以多山和高原为特色,山地、平原、盆地和高原四种地貌类型齐全。()
函数u=x2-2yz在点(1,-2,2)处的方向导数最大值为_______.
执行如下代码:fname=input(’’请输入要写入的文件:’’)fo=open(fname,’’w+’’)ls=[’’清明时节雨纷纷,’’,’’路上行人欲断魂,’’,’’借问酒家何处有?’’,\’’牧童遥指杏花村。’’]fo.writelin
【B1】【B7】
Theteacherwarnedthatanyonewhowascaught(cheat)______duringthetestwouldbepunished.
ShoppersintheUKarespendinglessmoneyontoiletpapertosavemoney,researchhasshown.Penny-pinchingUKconsumersch
最新回复
(
0
)