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 bunters, not climate change, drove elephants to extinction during the Pleistocene era(更新世), new research sugg
Hungry prehistoric bunters, not climate change, drove elephants to extinction during the Pleistocene era(更新世), new research sugg
admin
2013-06-17
46
问题
Hungry prehistoric bunters, not climate change, drove elephants to extinction during the Pleistocene era(更新世), new research suggests.
At least 12 kinds of elephants【S1】______to wander about the African, Eurasian, and American continents. Today, only two【S2】______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,【S3】______vegetation and broke up habitats(栖息地), causing the death of those unable to adapt to the new conditions. Another【S4】______blames prehistoric humans, whose improved weapons and hunting techniques allowed them to wipe out whole herds of elephants.
To help【S5】______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【S6】______regions should match human expansion into those regions. On the contrary, if the extinction was【S7】______to climate change, elephants should remain in regions【S8】______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【S9】______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 refuges【S10】______to humans, such as tropical forests, says Surovell.
A)uninviting I)hypothesis
B)migrated J)endurance
C)declined K)resolve
D)due L)polish
E)mysterious M)altered
F)specific N)used
G)already O)species
H)casually
【S9】
选项
答案
B
解析
此处应该是动词,而且是过去式,作谓语。migrated out of Africa意为“迁移出非洲”。
转载请注明原文地址:https://kaotiyun.com/show/DaM7777K
0
大学英语四级
相关试题推荐
Asubjectwhichseemstohavebeeninsufficientlystudiedbydoctorsandpsychologististheinfluenceofgeographyandclimate
Manyofthepeoplewhoappearmostoftenandmostgloriouslyinhistorybooksaregreatconquerorsandgeneralsandsoldiers,wh
Manyofthepeoplewhoappearmostoftenandmostgloriouslyinhistorybooksaregreatconquerorsandgeneralsandsoldiers,wh
YukonGoldRushDiscoveryInAugust1896,threepeopleledbySkookumJimMasonheadednorth,downtheYukonRiverfromthe
YukonGoldRushDiscoveryInAugust1896,threepeopleledbySkookumJimMasonheadednorth,downtheYukonRiverfromthe
YukonGoldRushDiscoveryInAugust1896,threepeopleledbySkookumJimMasonheadednorth,downtheYukonRiverfromthe
YukonGoldRushDiscoveryInAugust1896,threepeopleledbySkookumJimMasonheadednorth,downtheYukonRiverfromthe
YukonGoldRushDiscoveryInAugust1896,threepeopleledbySkookumJimMasonheadednorth,downtheYukonRiverfromthe
Peoplebecomequiteillogicalwhentheytrytodecidewhatcanbeeatenandwhatcannot.IfyoulivedintheMediterranean,for
Keepingafullsocialcalendarmayhelpprotectyoufromdementia(痴呆症),researcherssaidonMonday.【1】activepeoplewhowereno
随机试题
当达到K+平衡电位时()。
A.阳虚水泛证B.痰蒙神窍证C.痰浊壅肺证D.肺肾气虚证肺胀宜用涤痰汤治疗的证候是
不同性质的主观感觉的产生,主要决定于
A.精氨酸B.碳酸氢钠C.乳酸钠D.氨丁三醇E.葡萄糖治疗伴高钾血症及药物性心律失常的酸中毒,应首选的药物是
具有以下结构的药物是
病例对照研究中,选择偏倚不包括( )。
关于内文版式设计中的图文排式,说法正确的有()。
挫折是一把双刃剑,不断地激励着有目标的人,不断地打击着不学无术的人。挫折在一些没有坚定信念的人眼中,永远都只会是如临深渊、如履薄冰,而在坚定信念的人眼中,永远都是破除荆棘的利剑。这表明()。
2014年,商业营业用房对房地产开发投资同比增长的贡献率为:
以下关于KeyPress事件过程中参数KeyAscii的叙述中正确的是
最新回复
(
0
)