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
57
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."
According to Krom, the Egypt’s old Kingdom fell______.
选项
A、immediately after a period of drought.
B、immediately after a period of flood.
C、just before a drought struck.
D、just before a flood struck.
答案
A
解析
第五段有这么一个句子:…one of these periods…immediately came before the fall ofthe Egypt’s Old Kingdom.其中的一个时期……就发生在古埃及王国毁灭之前。可以看出,A应该是正确的答案。故答案为A。
转载请注明原文地址:https://kaotiyun.com/show/gbhi777K
0
在职申硕(同等学力)英语
相关试题推荐
苏宁电器收购香港激光公司2009年12月30日晚,苏宁电器(002024)在南京举行媒体通报会,正式宣布以3500万港元收购位列香港电器零售连锁前三甲的CiticallRetailManagementLtd.(以下简称“激光公司”),以此
Musiccomesinmanyforms;mostcountrieshaveastyleoftheirown.【C1】______theturnofthecenturywhenjazz(爵士乐)wasborn,Am
Computerstodayarecapableof______Themajorproblemwithcomputertranslatingprogramsisthatcomputers______
WhichofthefollowingisTRUE,accordingtothewriter?InvestorsareinterestedinInternetretailingbecause______.
InitialreportswerethatmultiplewavesofwarplanesbombedcentralBaghdad,hittingoilrefineriesandtheairport.
Americanculturehasnotbeenimmunetoculturalinfluencesfromoutside.TheideaofdemocracycamefromtheancientGreeks:th
Forthesereasons,thenewspaperishaving______problemsinthenorthofthecountry.
Inflationisaperiodofrapidrisesinprices.Whenyourmoneybuysfewergoodssothatyouget【C1】______forthesameamount
Onbehalfofmycompany,Iam______toyouandyourcolleaguesforyourgeneroushelp.
Whilethecollegecampusmaybetheperfectforuminwhichtoexhibityourtasteforthelatestinfashionstyle,theinterview
随机试题
A.右下肺文变阴影B.右下肺炎性阴影伴空洞有液平C.双下肺环状、卷发状阴影D.两肺多发性结节阴影支气管扩张
A.肺内压B.胸膜腔内压C.肺泡表面张力D.跨肺压E.跨胸壁压有助于肺保持扩张状态的是
关于合同中的技术标准和图纸地位的说法,不正确的是()。
企业已经确认销售商品收入发生销售折让时,应冲减当月的销售商品收入,不应该冲减销售商品的成本和相应的增值税销项税额。()
根据以下资料,回答下列问题。2006年某省从事高新技术产品出口的企业共计1.65万家,比2002年翻了一番。各类企业在数量上保持了增长态势,其中国有企业数量比2002年增长11%,合资企业数量增长23%,外商与港澳台商独资企业数量增长了1.5倍,集体企业
一台安装了签名识别软件的电脑——这种软件仅限于那些在文档中签名的人进入计算机——不仅通过分析签名的形状,而且通过分析诸如笔尖的压力和签名的速度等特征来识别某人的签名。即使是最机灵的伪造者也不能复制该程序能分析的所有特征。以下哪项结论能合逻辑地从上述陈述中推
A、连续但不可偏导B、可偏导但不连续C、可微D、一阶连续可偏导C
Aspartofmorecomprehensivecomplianceandethicsprograms,manycompanieshaveformulatedinternalpoliciespertainingtothe
Itisconsideredunwisetogiveachild______heorshewants.
A、Takesomeextratime.B、Putdownwhateverideasshehasfirst.C、Dosomeworkforanothercourse.D、Writethestoryendingfir
最新回复
(
0
)