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
1 Because a diamond is made of pure carbon, it has an immensely strong crystal structure, making it the hardest of all minerals.
1 Because a diamond is made of pure carbon, it has an immensely strong crystal structure, making it the hardest of all minerals.
admin
2019-07-01
80
问题
1 Because a diamond is made of pure carbon, it has an immensely strong crystal structure, making it the hardest of all minerals. Evidence suggests that diamonds were formed deep within the earth, and some stones may be three billion years old. Alluvial diamonds, those recovered from river gravel, can be carried long distances in rough water with other rocks. Diamond-bearing gravel is the result of one of nature’s sorting processes. Many of the diamonds found in gravel are of gem quality because flawed or fractured stones are more likely to be broken up and eroded away.
2 A diamond shines with great luster and fire, properties that are best revealed in the cut known as "brilliant." The brilliant cut dates from the seventeenth century and remains the most popular cut today because it enhances the brilliance of the gem with the least possible sacrifice of weight. It typically has 58 facets, but sometimes up to 104, and resembles two pyramids set base to base.
3 Most natural diamonds are nearly colorless, but truly colorless diamonds are rare. A few stones are found of all colors in the spectrum, and good-quality ones are known as "fancies." Diamonds of exceptional beauty and rarity are highly prized. Some have long, recorded histories, and others have inspired fantastic legends. The deep blue Hope diamond has a reputation for bringing bad luck; however, the sinister stories about it are untrue. At more than 45 carats, the Hope is one of the world’s largest diamonds and is apparently flawless.
In stating in paragraph 1 that diamond-bearing gravel is the result of one of nature’s sorting processes, the author means that
选项
A、the least desirable stones have been removed
B、diamonds travel long distances in rivers
C、the gravel is a mixture of different kinds of rock
D、diamonds are among the oldest stones on Earth
答案
A
解析
The author means that the least desirable stones have been removed. Sort means separate by type; a sorting process is an act of separation. During the long river journey, flawe d or fractured stones are more likely to be broken up and eroded away, leaving diamonds of gem quality in the gravel.
转载请注明原文地址:https://kaotiyun.com/show/glfO777K
0
托福(TOEFL)
相关试题推荐
Completethenotesbelow.WriteONEWORDONLYforeachanswer.EffectsofurbanenvironmentsonanimalsIntroductionRecenturba
Completethenotesbelow.WriteONEWORDONLYforeachanswer.EffectsofurbanenvironmentsonanimalsIntroductionRecenturba
Choosethecorrectanswer,A,BorC.Camber’sThemeParkBecomingamemberoftheAdventurers’Clubmeans
StrategiesforeffectiveuseoflecturesDosome【L25】________【L26】________andsitwhereyoucanseeandheareasily.Be【L27】___
ChooseTHREEletters,A-F,andwritethemnexttoQuestions38-40.Theinventionofdifferentgearsonabicycleaffectedwhich
JobSatisfactionandPersonnelMobilityEurope,andindeedallthemajorindustrializednations,iscurrentlygoingthrough
TheSnake’sForkedTongue1.Oneofthemostintriguingphysicalcharacteristicsofsnakesistheirforkedtongues.Whilethi
"LifeinOurSolarSystem"Althoughwecanimaginelifebasedonsomethingotherthancarbonchemistry,weknowofnoexampl
Theskyhadaneerieyellow-orangehue,withthesunglowingbehindapeculiarhaze.
Theskyhadaneerieyellow-orangehue,withthesunglowingbehindapeculiarhaze.
随机试题
可引起首过消除的主要给药途径是
履约保证书:
关于教育,下列说法不正确的是()
谵妄有昼轻夜重特点。()
牙釉质的无机化合物碳酸钙、磷酸镁和氟化钙占总量的
有价证券充抵期货保证金的种类、价值的计算方法和充抵保证金的比例等,由国务院期货监督管理机构规定。()
现代学制类型主要有()。
如果你是执法人员,在一次执法中,一个卖茶叶蛋的老婆婆看到你就跑,不小心摔倒了,你赶紧把她扶起来,她却大声说是你把她推倒的,旁边很多围观的人没有一个帮你说话,这时候你该怎么办?
【案情】张某与李某均为宠物爱好者。张某由于孩子降生,遂将自家的小狗抛弃于荒郊野外,此狗流浪一周,李某看着心疼不已,于是捡回家中饲养。一天,张某邻居谢某接儿子谢小某放学路过李某家,恰逢另一邻居王某拿石子打狗,狗一怒之下,将谢小某咬伤。谢某心疼不已,立刻将
如图所示是Windows2003系统DNS服务器中增加的l条资源记录,下列关于该资源记录的描述中,正确的是()。I创建的资源记录为邮件交换器记录II创建该记录时,在反向查找区域中创建相应的指针记录III该记录被
最新回复
(
0
)