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
69
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
Ifyouexhibitpositivetraitssuchashonestyandhelpfulness,thechances
Thisassumption______thattheforwardrateisanimpartialpredictorofthefu
Thinkbeforeyoupost.Youmightnotbeawareofhowmuchinformationyou’re
B
患者,男,19岁。手足心热,夜眠多梦,时有遗精,舌质红,脉细数。用药应首选的是(
2020年全国农民工总量28560万人,比上年减少517万人。其中,外出农民工1
2003年广告类节目时数中,广播要比电视多出∶A.56.18% B.
材料: 托班幼儿吃饭时普遍存在以下情况:不肯张嘴巴或不肯咀嚼吞咽。为解决这个问
美的集团是一家在深交所上市的科技集团,有六大事业部,分别负责研发和生产消费电器业
下列机械中,属于粉碎及筛分机的是()A.压缩机 B.提升机 C.球蘑机
最新回复
(
0
)