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
The term "Ice Age" may give a wrong impression. The epoch that geologists know as the Pleistocene and that spanned the 1.5 to 2.
The term "Ice Age" may give a wrong impression. The epoch that geologists know as the Pleistocene and that spanned the 1.5 to 2.
admin
2019-04-17
55
问题
The term "Ice Age" may give
a wrong impression
. The epoch that geologists know as the Pleistocene and that spanned the 1.5 to 2. 0 million years prior to the current geologic epoch was not one long continuous glaciation, but a period of oscillating climate with ice advances punctuated by times of interglacial climate not very different from the climate experienced now. Ice sheets that derived from an ice cap centered on northern Scandinavia reached southward to Central Europe. And beyond the margins of the ice sheets, climatic oscillations affected most of the rest of the world; for example, in the deserts, periods of wetter conditions(pluvials)contrasted with drier, interpluvial periods. Although the time involved is so short, about 0. 04 percent of the total age of the Earth, the amount of attention devoted to the Pleistocene has been incredibly large, probably because of its immediacy, and because the epoch largely coincides with the appearance on Earth of humans and their immediate ancestors.
There is no reliable way of dating much of the Ice Age. Geological dates are usually obtained by using the rates of decay of various radioactive elements found in minerals. Some of these rates are suitable for very old rocks but involve increasing errors when used for young rocks; others are suitable for very young rocks and errors increase rapidly in older rocks. Most of the Ice Age spans a period of time for which no element has an appropriate decay rate.
Nevertheless, researchers of the Pleistocene epoch have developed all sorts of more or less fanciful model schemes of how they would have arranged the Ice Age had they been in charge of events. For example, an
early classification of Alpine glaciation
suggested the existence there of four glaciations, named the Gunz, Mindel, Piss, and Wurm. This succession was based primarily on a series of deposits and events not directly related to glacial and interglacial periods, rather than on the more usual modern method of studying biological remains found in interglacial beds themselves interstratified within glacial deposits. Yet this succession was forced willy-nilly onto the glaciated parts of Northern Europe, where there are partial successions of true glacial ground moraines and interglacial deposits, with hopes of ultimately piecing them together to provide a complete Pleistocene succession. Eradication of the Alpine nomenclature is still proving a Herculean task.
There is no conclusive evidence about the relative length, complexity, and temperatures of the various glacial and interglacial periods. We do not know whether we live in a postglacial period or an interglacial period. The chill truth seems to be that we are already past the optimum climate of postglacial time. Studies of certain fossil distributions and of the pollen of certain temperate plants suggest decreases of a degree or two in both summer and winter temperatures and, therefore, that we may be in the declining climatic phase leading to glaciation and extinction.
The "wrong impression"(line 1.)to which the author refers is the idea that the______.
选项
A、climate of the Pleistocene epoch was not very different from the climate we are now experiencing
B、climate of the Pleistocene epoch was composed of periods of violent storms
C、Pleistocene epoch consisted of very wet, cold periods mixed with very dry, hot periods
D、Pleistocene epoch comprised one period of continuous glaciation during which Northern Europe was covered with ice sheets
答案
D
解析
文章首段第二句对“wrong impression”进行了补充说明,认为“地质学家所熟知的先于目前地质时期150万年和200万年的更新世时期并非一段漫长连续的冰蚀,期间温度不断波动,冰块迁移的过程中时不时伴有间冰期的气候,而这种间冰期气候与我们现在的气候相差无几”,由此可知,更新世时期的冰蚀现象并非连续不间断的,“错误印象”即是“更新世时期包含一段漫长连续的冰蚀”。因此,D项为正确答案。A项属于以偏概全,更新世时期除了包括与我们现在相近的气候,还有冰蚀。B、C两项文中没有提及。
转载请注明原文地址:https://kaotiyun.com/show/G6ra777K
本试题收录于:
翻译硕士(翻译硕士英语)题库专业硕士分类
0
翻译硕士(翻译硕士英语)
专业硕士
相关试题推荐
美国南北战争期间,林肯总统在()发表了著名的演讲。他在纪念内战之惨烈、将士之牺牲的同时,表达了对“民有、民治、民享的政府”(“governmentofthepeople,bythepeople,forthepeople”)的信念。
PopstarstodayenjoyastyleoflivingwhichwasoncetheprerogativeonlyofRoyalty.Wherevertheygo,peopleturnoutinthe
Despitethefactthatthecommission’sreporttreatsavitallyimportanttopic,thereportwillbe______readbecauseitsprose
IndigenousAustraliansbelievethatreconciliationisnecessarybutthegovernmentshould,mostimportantly,makeaformalapolo
Theyweregivennothing______drybreadandwaterfortheireveningmeal.
Thecomingoftherunwaysinthe1830’s______oursocietyandeconomiclife.
A______ofthelongreportbythebudgetcommitteewassubmittedtothemayorforapproval.
Frenchtoys:onecouldnotfindabetterillustrationofthefactthattheadultFrenchmanseesthechildasanotherself.Allt
Theideaofculturalpreservationandtheteachingofhumanitiesare______.However,therehasbeenalong-standinglackofempha
随机试题
简述股权取得日购买法和权益结合法的区别。
患者,男,60岁。糖尿病病史10年,检查:双下肢浮肿,尿蛋白(+++),空腹血糖8.0mmol/L,餐后2小时血糖11.13mmol/L,血压160/100mmHg。其诊断是
化生“天癸”的物质基础是
【案情】孙某与钱某合伙经营一家五金店,后因经营理念不合,孙某唆使赵龙、赵虎兄弟寻衅将钱某打伤,钱某花费医疗费2万元,营养费3000元,交通费2000元。钱某委托李律师向甲县法院起诉赵家兄弟,要求其赔偿经济损失2.5万元,精神损失5000元,并提供
小砌块砌体施工时对砂浆饱满度的要求严于砖砌体的要求。()
【背景资料】某新建办公楼工程,建筑面积48000m2,地下2层,地上6层,中庭高度为9m,钢筋混凝土框架结构。经公开招标投标,总承包单位以31922.13万元中标,其中暂定金额1000万元。双方依据《建设工程合同(示范文本)》(GF一
规范化服务的标准是()。
2015年1~4季度该市人均消费支出八大类中,同比增长的大类占人均消费总支出的比重比同比下降的大类()个百分点。
Youaregoingtoreadalistofheadingsandatextaboutwhatparentsaresupposedtodotoguidetheirchildrenintoadulthood
(46)Ifyouconsultcomparativeglobaleconomicandsocialstatistics,itisnotdifficulttopaintableakpictureofArabfailu
最新回复
(
0
)