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
专升本
Many theories about the origin of the ocean have been proposed by scientists. The most widely accepted one is that the earth at
Many theories about the origin of the ocean have been proposed by scientists. The most widely accepted one is that the earth at
admin
2011-05-26
33
问题
Many theories about the origin of the ocean have been proposed by scientists. The most widely accepted one is that the earth at some time in its very early history became hot enough to melt the materials from which it was formed. While in this molten state, lighter rock-forming materials (造岩材料) floated on the surface of the heavier ones. Then, between four and a half four billion (十亿) years ago, the molten earth cooled sufficiently to form a crust of rock that was many miles thick.
Surrounding the earth was an unbroken canopy of clouds miles thick and made up mostly of water vapor. Rain falling toward the still-hot earth was heated to steam and rose to the clouds again. After many millions of years, as the earth continued to cool, its surface temperature fell below the boiling point of water. Rainwater could now remain on the earth, covering its whole surface except for the higher places on earth that had been formed from the lighter rock materials.
In 1970, scientists had pieced together evidence that the lighter rock materials had formed one huge continent by a vast ocean. Then, about 200 million years ago, the great continent began to break up, the pieces moving slowly apart.
The onrushing waters of the single huge ocean now entered and filled the spaces between the separating continents--and became the several oceans and seas we know today.
This passage mainly talks about ______.
选项
A、the origin of the earth
B、the origin of the ocean
C、the history of the earth
D、the forming of the earth’s crust
答案
B
解析
根据第一段第一、二句,Many theories about the origin of the ocean have been proposed by scientists.The most widely accepted one is that...作出该项选择。
转载请注明原文地址:https://kaotiyun.com/show/VqqC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
Wouldyouplease______meacupofcoffee?
Theexhibitionwasnotverycrowded.Therewere______peoplethanIexpected.
Heiswidely______asoneofourbestyoungscientists.
Ican’teatouttonight.Ihave______todo.
Onetypeofpersonthatiscommonineverycountryistheonewho______.Bothofthesetypesofpeopleareusually______thei
Idon’tfeellike_______outtonight.
Pleasedon’tbeangry.I______tohelpratherthantohurtyou.
--Marywon’tgototheconcerttonight.--______.
SinceApril,anewflunamedA-HlNl(originallycalledswineflu)hasaffectedover100,000peopleinmorethan40countries.S
Morethanoneexample______necessarytomakethestudentsunderstandthisruleclearly.
随机试题
单件商品净含量标注的计量要求不包括()。
首次使用“政治经济学”一词的是()
Wisebuyingisapositivewayinwhichyoucanmakeyourmoneygofurther.Thewayyougoaboutpurchasinganarticleoraservi
患者,男,15岁。腰背部疼痛3个月,近来右髋疼痛。骨盆X线片显示右髋关节间隙轻度变窄,双侧骶髂关节间隙模糊。根据以上情况,进一步证实诊断的检查手段是
患者,男,28岁。查BP160/95mmHg,Hb85g/L,尿蛋白(+),颗粒管型2~3个/HP,BUN10mmol/L,Cr220μmol/L。对该患者不宜采取的是
隐性感染是指
处理因计量器具准确度所引起的纠纷时应该参照的检定数据是
国家建立基本医疗卫生制度,建立健全医疗卫生服务体系。医疗卫生事业应当坚持的原则是
关于设定受益计划,下列项目中应计入其他综合收益的有()。
一对表现正常的夫妇有一个正常的男孩和一个患有某种遗传病的女孩。如果该男孩与一个母亲为该病患者的正常女子结婚,生了一个正常的儿子,问这个儿子携带致病基因的几率为()。
最新回复
(
0
)