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
56
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://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
Stereotypesaretroublesomebecausetheyareoftenindiscriminate,exhibitanallnessorientation,andcanproducefrozenevalu
Accordingtoexperts,companionshipandsocialsupportarevitaltobothourpsychologicalandphysicalwell-being—onereason,p
Accordingtoexperts,companionshipandsocialsupportarevitaltobothourpsychologicalandphysicalwell-being—onereason,p
Accordingtoexperts,companionshipandsocialsupportarevitaltobothourpsychologicalandphysicalwell-being—onereason,p
Accordingtoexperts,companionshipandsocialsupportarevitaltobothourpsychologicalandphysicalwell-being—onereason,p
TheUnitedStateshaslongbeenknownasanationofimmigrantsbecausemanyofitspeople______fromsettlerswhocamefromall
Accordingtoexperts,companionshipandsocialsupportarevitaltobothourpsychologicalandphysicalwell-being—onereason,p
Accordingtoexperts,companionshipandsocialsupportarevitaltobothourpsychologicalandphysicalwell-being—onereason,p
Accordingtoexperts,companionshipandsocialsupportarevitaltobothourpsychologicalandphysicalwell-being—onereason,p
随机试题
烧伤休克复苏常用的胶体液有
关于化脓性脑膜炎抗生素的使用原则,以下不正确的是
矿渣水泥不适宜用作()。
案例六:齐先生准备为其刚出生的女儿购买一份教育年金保险。根据保险合同的规定,孩子0岁到15岁期间为交费期,年交保费3650元,年初支付。18岁至20岁每年领取15000元大学教育金,年初领取;21岁时领取15000元大学教育金和5000元大学毕业祝贺金,
甲公司2015年年初的递延所得税资产借方余额为50万元,与之对应的预计负债贷方余额为200万元;递延所得税负债无期初余额。甲公司2015年度实现的利润总额为9520万元,适用的企业所得税税率为25%且预计在未来期间保持不变;预计未来期间能够产生足够的应纳
我国的根本政治制度是()。
由于组配或装载不当以及运输工具的类型变化等原因,造成货物无法全部装完而必须甩下一部分货物,往下批补装的运输称为()。
信息发布会中,发言人的发言稿既要紧扣主题,又要()。
“能对事物或现象进行观察比较,发现其相同与不同”,这一目标涉及的年龄段是()
金字塔
最新回复
(
0
)