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
36
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.
【C10】
选项
答案
Only
解析
(该句的意思是“只有那些知道怎样让标记显现的人才能识别钻石是否做了标记”,only表示“只有”。)
转载请注明原文地址:https://kaotiyun.com/show/iwNK777K
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
Robotsareusefulinexploringspacebecausetheycanworkintheconditionswhichexistinspace.Suchrobotsusuallylooklike
TheUnitedStateshaslongbeenknownasanationofimmigrantsbecausemanyofitspeople______fromsettlerswhocamefromall
ThemanwatchesthevideobecauseitwasrequiredbyProfessorStephen.
Stereotypesaretroublesomebecausetheyareoftenindiscriminate,exhibitanallnessorientation,andcanproducefrozenevalu
Accordingtoexperts,companionshipandsocialsupportarevitaltobothourpsychologicalandphysicalwell-being—onereason,p
Accordingtoexperts,companionshipandsocialsupportarevitaltobothourpsychologicalandphysicalwell-being—onereason,p
Accordingtoexperts,companionshipandsocialsupportarevitaltobothourpsychologicalandphysicalwell-being—onereason,p
Accordingtoexperts,companionshipandsocialsupportarevitaltobothourpsychologicalandphysicalwell-being—onereason,p
随机试题
在等容舒张期,心脏瓣膜的状态是【】
下列哪一种中毒不宜洗胃
患者男性,63岁,患前列腺增生4年,近半年尿频明显,排尿困难,偶有尿流中断一个月,此次复查泌尿系超声,发现前列腺非均质性改变更加明显,并出现两个稍高回声结节,但未见明显血流信号。为明确结节的性质,最有价值的诊断方法是
以下哪项不是造成食管胃弓上吻合术后胸胃排空的功能性障碍的原因
A.CD3+CD4+CD8-B.CD3-CD16+CD56+C.CD4+CD25+D.CD3+CD4-CD8+E.CD19+CD20+NK细胞的典型表面标志是
患者,男性,82岁,肺心病,近半个月来咳嗽、咳痰,今晨呼吸困难加重,恍惚,烦躁不安。查体:体温36.4℃,脉搏120次/分,血压130/80mmHg。呼吸38次/分,口唇发绀。两肺底闻及湿啰音。患者最可能出现的并发症是()。
下列选项中,属于资深的估价学会会员所具备的资控的是()。①良好的候选会员;②年龄在28岁以上;③年龄在25岁以上;④通过有关的考试;⑤通过学会的考试;⑥估价实务经验在五年以上;⑦经学会分会推荐⑧提交两份优秀的估价报告书,其中一份须是收益性不动
下列()属于变造会计凭证的行为。
九三学社的原名是()。
[A]Watchingrelatedexpensesandmakingwisechoice[B]Payingattentiontodetails[C]Weighingyourfinancialgoalsandexpec
最新回复
(
0
)