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
考研
Even ancient Egypt’s mighty pyramid (金字塔) builders were powerless in the face of the famine (饥荒) that helped bring down their ci
Even ancient Egypt’s mighty pyramid (金字塔) builders were powerless in the face of the famine (饥荒) that helped bring down their ci
admin
2012-08-24
34
问题
Even ancient Egypt’s mighty pyramid (金字塔) builders were powerless in the face of the famine (饥荒) that helped bring down their civilization around 2180 B. C. Now evidence collected from mud deposited by the River Nile suggests that a shift in climate thousands of kilometers to the south was ultimately to blame—- and the same or worse could happen today.
The ancient Egyptians depended on the Nile’s annual floods to irrigate their crops. But any change in climate that pushed the African monsoons (季风) southwards out of Ethiopia would have reduced these floods.
Declining rains in the Ethiopian highlands would have meant fewer plants to stabilize the soil. When rain did fall it would have washed large amounts of soil into the Blue Nile and into Egypt, along with sediment (沉积) from the White Nile.
Blue Nile mud has a different isotope (同位素) signature from that of the white Nile. So by analyzing isotope differences in mud deposited in the Nile Delta. Michael Krom of Leeds University worked out what proportion of sediment came from each branch of the river.
Krom reasons that during periods of drought, the amount of Blue Nile mud in the river would be relatively high. He found that one of these periods, from 4500 to 4200 years ago. immediately came before the fall of the Egypt’s old Kingdom.
The weakened waters would have been disaster for the Egyptians. "Changes that affect food supply don’t have to be very large to have a ripple (波浪) effect in societies," says Bill Ryan of the Lamont Doherty Earth Observatory in New York.
Similar events today could be even more devastating, says team member Daniel Stanley. A scientist from the Smithsonian Institution in Washington D. C. "Anything humans do to shift the climate belts would have an even worse effect along the Nile system today because the populations have increased dramatically."
Why does the author mention "Egypt’s mighty pyramid builders"?
选项
A、Because they once worked miracles.
B、Because they were well-built.
C、Because they were actually very weak.
D、Because even they were unable to rescue their civilization.
答案
D
解析
文章开头的意思是:即使古埃及伟大的金字塔建筑者面对那场在公元前2180年促使他们文明毁灭的饥荒也无能为力。D说的是:即使是他们也不能挽救他们的文明。因此D是正确的答案。故答案为D。
转载请注明原文地址:https://jikaoti.com/ti/QrOjFFFM
0
在职申硕(同等学力)英语
相关试题推荐
女性,40岁,5天来高热、腰痛伴尿频、尿痛、尿急,曾口服环丙沙星两天不见好转。既往无类似发作史,1个月前曾发现肾盂结石,未积极治疗。查体:体温39℃,右肾区叩击痛,蛋白尿(+),WBC20~30个/HP,偶见白细胞管型,尿比重1.025。最可能的诊断是
男性,30岁,罹患消化性溃疡2年余,经常反复发作,曾应用多种药物治疗。下列治疗药物中,属于胃黏膜保护剂的药物是
AttheKyotoconferenceonglobalwarminginDecember1997,itbecameabundantlyclearhowcomplexithasbecometoworkoutint
AttheKyotoconferenceonglobalwarminginDecember1997,itbecameabundantlyclearhowcomplexithasbecometoworkoutint
IfyoureadCanadianEnglishDictionaries,youAcertainlyfindbothAmericanandBritishspellingsBlisting,andthefirstword
One’sawareness,bothconsciousandunconscious,ofwhathappenedinthepasthasastronginfluenceonone’sbehavior.
Technologyhas______thesharing,storageanddeliveryofinformation,thusmakingmoreinformationavailabletomorepeople.
Forthispart,youaretowriteacompositionof120to150wordsonWhichisMoreImportant,WealthorHealth?Inyourcomposit
ProfessorWutraveledandlecturedthroughoutthecountryto______educationandprofessionalskillssothatwomencouldentert
Skilledtechniciansandadvancedtechnologiesenableustobuilduncompromisedqualityintoallourcars,becauseourfirst____
随机试题
下列各项措施中可以减小随机误差的是()
影响藻酸盐印模材料凝固时间的因素除了
在爱牙日社区口腔健康咨询中人们提出了不少问题.口腔预防保健人员进行了认真分析.策划在不同人群中开展口腔健康教育活动。根据我国具体情况.残疾人的口腔保健应从以下几个方面进行.除外
在治疗痢疾上,提出通因通用的治痢原则的医家是()
位于胫骨内侧髁下缘凹陷中的腧穴是
房地产抵押权人对抵押房地产享有的权利不包括:()。
中国证券登记结算有限责任公司为投资者开立证券账户而委托的开户代理机构包括()。Ⅰ.证券公司Ⅱ.商业银行Ⅲ.中国证券登记结算有限责任公司境外B股结算会员Ⅳ.证券交易所
《物业管理条例》规定建设单位制定业主临时公约的时间为()。
教师的个性、情绪、健康以及处理人际关系的品质等统称为教师的________。
三角形对于平面相当于()对于()
最新回复
(
0
)