首页
登录
职称英语
Hungry prehistoric hunters, not climate change, drove elephants to extinctio
Hungry prehistoric hunters, not climate change, drove elephants to extinctio
游客
2023-07-16
66
管理
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 [br] 【1】
选项
答案
N
解析
此处需要能跟不定式词to的动词作谓语的一部分。从词库中的六个动词来看,used与to搭配,意为“过去常常”,与后一句的Today形成对比,故为答案。
转载请注明原文地址:http://tihaiku.com/zcyy/2843311.html
相关试题推荐
Asthenatureofinsiderdealingchanged,therewasacorrespondingneedto____
ExchangeRates:ABriefHistoryofExchangeRatesForcenturies,
ExchangeRates:ABriefHistoryofExchangeRatesForcenturies,
ExchangeRates:ABriefHistoryofExchangeRatesForcenturies,
ExchangeRates:ABriefHistoryofExchangeRatesForcenturies,
ExchangeRates:ABriefHistoryofExchangeRatesForcenturies,
ExchangeRates:ABriefHistoryofExchangeRatesForcenturies,
ExchangeRates:ABriefHistoryofExchangeRatesForcenturies,
[originaltext]Therehavebeenmanygreatinventions,thingsthatchangethe
Strikingchangesinhispersonalitywere______byaseriesofunfortunateevent
随机试题
TheIELTSExamIELTS:InternationalEnglishLanguag
Whichsporthasthemostexpenses____trainingequipment,players’personalequip
EconomistssayconfidenceintheU.S.economyhasimprovedsincethefinanci
GrowingMoreFoodwithLessWater[A]Sixthousandyearsagofarm
Gesturesarethesilentlanguageofeveryculture.Itisimportanttoknowt
患者,女性,27岁。已婚,有功血史,经治疗好转。此次停经3个月后,阴道持续出血3
患者男,56岁,前列腺切除术后膀胱冲洗时,冲洗液引流不畅。首先应采取的护理措施是
医学模式转变在医学伦理方面的重要性是指A:促进了医学思维方式的变革 B:提高了
以下属于我国邮政部门的专营业务的是()。A:信函业务 B:印刷品 C:小包
到期不缴纳税务罚款的,税务机关可以对当事人每日按罚款数额的()加处罚款。A
最新回复
(
0
)