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
Diamond is the hardest naturally occurring substance known. It is the most popular gemstone and because of its extreme 【C1】_____
Diamond is the hardest naturally occurring substance known. It is the most popular gemstone and because of its extreme 【C1】_____
admin
2019-03-14
76
问题
Diamond is the hardest naturally occurring substance known. It is the most popular gemstone and because of its extreme 【C1】______(hard), it is also used for various industrial purposes. Scientists are still 【C2】______(sure)of the exact process by which diamonds are naturally formed, but it is certain that both extreme heat and enormous pressure are needed. It is, therefore, likely that diamonds were formed far【C3】be______the Earth’s surface where these conditions exist. The first synthetic diamonds were successfully produced in the 1950s, but the best and largest stones are still those created by nature.
The word ’ diamond’ comes from the Greek ’ adamas’ , which means invincible, but the first definite reference to diamonds occurs in Roman literature of the first century A. D. The diamonds known to the Romans came from India, which was the only 【C4】______(supply)of the stones until the eighteenth century. In 1762, diamonds were discovered in Brazil, and then in 1866 in South Africa, the main source of diamonds in the world today.
The idea that men should give diamonds to the women they 【C5】______is quite new. It was invented in the last century by De Beers, the company that owns the South African diamond mines. The idea that ’diamonds are forever’ does not hold water either. Although diamonds are very hard, they can be【C6】dam______.
The largest of all known diamonds was the Cullinan. It was【C7】disc______in South Africa in 1905 and given to Edward VII, king of Great Britain. It was cut into smaller stones, the largest of which—and still the largest cut diamond in 【C8】______(exist)—is called the Star of Africa.
There have been a lot of diamond thefts in recent years, but scientists can now mark stones to show who own them. Usually this mark is 【C9】______(visible), so thieves can’t tell if a diamond is marked. 【C10】O______the people who know how to make the mark appear can tell whether a diamond is marked or not.
【C3】
选项
答案
below
解析
(该句的意思是“因此,钻石很可能形成于地表以下很深的地方,这样的地方具备它形成的条件。”由给出的单词部分可知本题应填入的单词为“below”。)
转载请注明原文地址:https://www.kaotiyun.com/show/KwNK777K
本试题收录于:
C类竞赛(非英语专业本科)题库大学生英语竞赛(NECCS)分类
0
C类竞赛(非英语专业本科)
大学生英语竞赛(NECCS)
相关试题推荐
Stereotypesaretroublesomebecausetheyareoftenindiscriminate,exhibitanallnessorientation,andcanproducefrozenevalu
Accordingtoexperts,companionshipandsocialsupportarevitaltobothourpsychologicalandphysicalwell-being—onereason,p
Accordingtoexperts,companionshipandsocialsupportarevitaltobothourpsychologicalandphysicalwell-being—onereason,p
Robotsareusefulinexploringspacebecausetheycanworkintheconditionswhichexistinspace.Suchrobotsusuallylooklike
ThemanwatchesthevideobecauseitwasrequiredbyProfessorStephen.
Stereotypesaretroublesomebecausetheyareoftenindiscriminate,exhibitanallnessorientation,andcanproducefrozenevalu
Stereotypesaretroublesomebecausetheyareoftenindiscriminate,exhibitanallnessorientation,andcanproducefrozenevalu
Althoughwehadtoldthemnottokeepuswaiting,theymadeno______tospeedupdeliveries.
Accordingtoexperts,companionshipandsocialsupportarevitaltobothourpsychologicalandphysicalwell-being—onereason,p
随机试题
在PowerPoint2010中,下列说法错误的是
A.国家一级保护野生药材B.国家二级保护野生药材C.国家三级保护野生药材D.中药一级保护品种E.中药二级保护品种相当于国家一级保护野生药材物种的人工制成品可申请
患者,女性,67岁。3天未排便。目前应采取的措施是
为提高工作效率,经单位会计机构负责人批准,出纳人员可以兼任会计档案保管和债权债务账目的登记工作。()
在利率水平极高时,货币需求会趋向无穷大,这被称为流动性陷阱。()
学习过程中,人的精神状态和注意力存在三种变化模式,即()。
我国民事经济仲裁实行()。
金融市场的宏观经济功能不包括()。
标准模块中有如下程序代码:PublicxAsInteger,yAsIntegerSubvatpub(),x=10:y=20EndSub在窗体上有1个命令按钮,并有如下事件过程:PrivateSubCommandlClick
Whatisthemaintopicofthisconversation?
最新回复
(
0
)