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
外语
The last of the dinosaurs lived during a time called the Cretaceous period. This time period lasted from about 135 million to 65
The last of the dinosaurs lived during a time called the Cretaceous period. This time period lasted from about 135 million to 65
admin
2014-01-13
63
问题
The last of the dinosaurs lived during a time called the Cretaceous period. This time period lasted from about 135 million to 65.5 million years ago. Some sources give the years of 146,145, or 144 million to 65 million years ago.
In the Cretaceous period, the middle of North America was covered by a shallow sea. The Atlantic Ocean began opening up between Europe and North America as those continents rifted. Other continents that had begun pulling away from each other in the Jurassic continued drifting apart. India was an island by itself.
Evergreen trees, mosses, and ferns had been the main types of plants, but now in the Cretaceous, flowering plants appeared. Bees did, too. Hardwood trees like oaks and maples first appeared in the fossil record.
Modem birds and mammals came into the fossil record. Tyrannosaurus and Triceratops came into existence. So did other ceratopsian dinosaurs, relatives of Triceratops, with their wide variety of facial horns and neck frills. Great herds of perhaps 10,000 Triceratops roamed the edges of the North American Inland Sea. The climate began to cool.
At the end of the Cretaceous, another mass extinction wiped out as much as 90 percent of marine life and 50 percent of life on land. There were no more dinosaurs after the end of the Cretaceous, at about 65.5 million years ago. The Cenozoic era, also called the Age of Mammals, began.
The author’s main purpose for writing this was to______.
选项
A、inform
B、entertain
C、warn
D、persuade
答案
A
解析
纵观全文,作者主要讲述了白垩纪时期的生物、植物以及大陆板块的变化。据此可知,作者是要告知读者某些信息,因此A项正确。
转载请注明原文地址:https://kaotiyun.com/show/i6QO777K
0
考博英语
相关试题推荐
Atthesightofherhusbandgettingoffthetrain,thewomanwalkedforwardand______himandstrokedhiswhitehair.
1.Asanimportantmeansforpreservingknowledge,variousliteratureshavebecomepreciousresourcesforthemankind,whichhav
Apunctualpersonisinthehabitofdoingathingatthe【11】timeandisneverlateinkeepinganappointment.Heknowsthathe
IndustrialproductionmanagerscoordinatetheresourcesandactivitiesrequiredtoproducemillionsofgoodseveryyearintheU
ToliveintheUnitedStatestodayistogainanappreciationforDahrendorf’sassertionthatsocialchangeexistseverywhere.T
positiondefineforgetfulfancykeybalanceimportanceunhealthylacksubjectopenple
Anofficeisthe"brain"ofabusiness.Inanoffice,figures,listsandinformationarecompiledwhichtellthemanagersorhe
【T1】上周四,世界观察研究学会一年一度的“地球健康体检”报告出炉。2005年,地球的森林砍伐量创历史新高,这是该报告强调的众多环境问题征兆之一。该驻华盛顿智囊机构在一份题为“地球生命征兆2007—2008”的报告中指出,从肉类消费量的不断增长到
Scientistsaresearchingforwaystodestroynuclearweaponsinspace—tomakenuclearweaponspowerlessandnolongeruseful.Th
随机试题
Thisletterwillensureyouaninterview.
Mostchildrenwithhealthyappetitesarereadytoeatalmostanythingthatisofferedtothemandachild’srarelydislikesfoo
有关窗宽、窗位的叙述,不正确的是
需要施工单位组织专家进行论证的危险性较大的分部分项工程主要是涉及()。
供货批次合格率、供货抽检缺陷率属于()。
甲将画家乙赠给自己的画上的乙的署名刮去,盖上自己的印章,并将画挂在自己的家中,则甲侵害了乙的()。
氢:氧:水
论述班主任工作对班集体发展和学生品德发展的影响。(2017年华东师大)
在医院,每个医生只属于某一个诊疗科,医生同一天可为多位患者看病,而一名患者可在多个科室治疗。则;体医生和患者之间的联系是()。
ThepeopleoftheUSAhavebeenopposedtoacentralizedgovernmentsincelongbeforetheRevolutionof1776.Whenthe13coloni
最新回复
(
0
)