首页
登录
职称英语
[img]2016m12s/ct_eyyjscz2015j_eyyjsccloze_0151_201611[/img] Diamond is the h
[img]2016m12s/ct_eyyjscz2015j_eyyjsccloze_0151_201611[/img] Diamond is the h
游客
2023-10-17
26
管理
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. [br] 【C8】
选项
答案
existence
解析
(该句的句意为“它被切割成小的钻石,其中最大的那颗仍然是现存的最大的切钻”,inexistence表示“现存的;现有的”。)
转载请注明原文地址:https://tihaiku.com/zcyy/3105803.html
相关试题推荐
[img]2016m12s/ct_eyyjsdm_eyyjsdreadb_0064_201612[/img]【B1】______Manyofthe
[img]2016m12s/ct_eyyjsdm_eyyjsdreadb_0064_201612[/img]【B1】______Manyofthe
[img]2016m12s/ct_eyyjsdm_eyyjsdreadd_0076_201612[/img]Certainbirdsare,mo
[img]2016m12s/ct_eyyjsdm_eyyjsdreadd_0076_201612[/img]Certainbirdsare,mo
[img]2016m12s/ct_eyyjsdm_eyyjsdreadd_0076_201612[/img]Certainbirdsare,mo
WaterforLife[img]2016m12s/ct_eyyjsdm_eyyjsdcloze_
WaterforLife[img]2016m12s/ct_eyyjsdm_eyyjsdcloze_
WaterforLife[img]2016m12s/ct_eyyjsdm_eyyjsdcloze_
WaterforLife[img]2016m12s/ct_eyyjsdm_eyyjsdcloze_
WaterforLife[img]2016m12s/ct_eyyjsdm_eyyjsdcloze_
随机试题
Animationisolderthancinema,indeedalmostasoldasphotography.Niepc
Still,tohavecapturedsuch______inanotherlanguageisamajoraccomplishment.
Labelthemapbelow.WritethecorrectletterA-lnexttoQuestions18-20.[img]
不同股票指数的区别主要在于()。A、交易对象不同B、编制方法不同C、交易目的不同D、交割方式不同B不同股票指数的区别主要在于其具体的编制方法不
Memoryisourmostimportantpossession.Withoutmemory,youwouldn’tknoww
在大城市的CBD中心区,影响交通组织的主要因素是:Ⅰ容积率Ⅱ路网密度Ⅲ建筑类别Ⅳ
运输距离增加,单位运输支出会()。A.上升 B.下降 C.不变
会计师事务所申请证券资格,应当符合的条件包括()。 Ⅰ、依法成立5年以上,且
小儿指纹色青多为A.外感表证 B.里实热证 C.痛症,惊风 D.血络失充
(2020年真题)根据会计法律制度的规定,下列企业会计档案中,最低保管期限为30
最新回复
(
0
)