首页
登录
职称英语
1 Because a diamond is made of pure carbon, it has an immensely strong crystal s
1 Because a diamond is made of pure carbon, it has an immensely strong crystal s
游客
2024-01-02
73
管理
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. [br] 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://tihaiku.com/zcyy/3328135.html
相关试题推荐
Peopleworkbecausetheyneedmoneytolive.Whataresomeotherreasonstha
Becauseof______,mastiffbatsrequireconsiderablespacetotakeoffinflight.
ABecauseoftheshortBgrowingseason,treesathighaltitudesmayCnothaveeno
AllastronautsAcarryapassportBduringtheyaretravelinginspaceCbecauseth
Motivationisadifficultsubject______becausesomanydifferentfactorsinfluen
ABecauseoftheirhighrateofpredation,BitisnotunusualforrabbitsCproduc
1Becauseadiamondismadeofpurecarbon,ithasanimmenselystrongcrystals
Coalisclassifiedasafossilfuelbecause______ismadefromcompressedplant
Ofallthesenses,itis______thattriggersthestrongestmemoriesandemotions.
Becauseitdecomposesviolentlywhendisturbed,______mustbehandledcautiously
随机试题
Themoretimeswehavewalkedaroute,thelongerwejudgeittobe,aUKre
Innovation,theeffectiverecipeofprogress,hasalwayscostpeopletheirj
板式排烟口打开后无法联动启动排烟风机,先用万用表测量联动线路通断;再用万用表测量
驾驶机动车下长坡时,连续使用行车制动器,以下说法正确的是什么?()A.会缩短发
A.左心室容量负荷过重 B.左心室压力负荷过重 C.右心室容量负荷过重 D
实际股价形态中出现最多的一种形态是( )。A.双重顶(底)形态 B.喇叭形以
疑似细胞免疫缺陷的患者,应做下列中的A.O-T试验B.狄克试验C.锡克试验D.巨
属于QUACERS模式目标的是<P>A.持续不断地改进<br>B.强调全员参与<
下边四个图形中,只有一个是由上边的四个图形拼合(只能通过上、下、左、右平移)而成
属于甲类传染病的是?A.鼠疫 B.传染性非典型肺炎 C.肺结核 D.艾滋病
最新回复
(
0
)