首页
登录
职称英语
The last of the dinosaurs lived during a time called the Cretaceous period.
The last of the dinosaurs lived during a time called the Cretaceous period.
游客
2025-04-14
28
管理
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. [br] 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://tihaiku.com/zcyy/4037609.html
相关试题推荐
Duringthe1700sand1800s,majorfightingduringwarsgenerallyceasedfor
Duringthe1700sand1800s,majorfightingduringwarsgenerallyceasedfor
Funiswhatweexperienceduringanact.Happinessiswhatweexperienceaftera
Completesilenceisfoundonlyinlaboratoriescalledanechoicrooms.Thewa
Completesilenceisfoundonlyinlaboratoriescalledanechoicrooms.Thewa
Completesilenceisfoundonlyinlaboratoriescalledanechoicrooms.Thewa
Marriagetherapiststeachaskillcalledactivelistening.Eachpartnertake
Marriagetherapiststeachaskillcalledactivelistening.Eachpartnertake
Thestudyofgeneticshasgivenrisetoaprofitablenewindustrycalledbio
Thestudyofgeneticshasgivenrisetoaprofitablenewindustrycalledbio
随机试题
HedrivesMuch______thanhedidtenyearsago.A、carefullyB、MorecarefulC、More
[img]ct_epem_epelisv_00511(20097)[/img][br][originaltext]Thewomanwithlong
Solveeachofthefollowingequationsforx.(a)5x-7=28(b)12-5x=x+30(c)5
Theyovercameallthedifficultiesandcompletedtheprojecttwomonthsaheadof
射干药材的性状特征是A.卵圆形、长卵形或长纺锤形,断面金黄色B.不规则的结节状,
关于血清胆碱酯酶催化活性浓度测定的叙述,错误的是A.肝功受损时胆碱酶活性明显升高
建设单位应当将大型的人员密集场所和其他特殊建筑工程的消防设计文件报送公安机关消防
在[0,10]上的最大值和最小值依次为( )。
采用追溯调整法,需要做的工作有()。 A.在会计政策变更的当年采用新的会计政
(2018年真题)下列不是职务侵占罪与贪污罪的主要区别之一的是()。A.刑
最新回复
(
0
)