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
They sparkle and glitter in the light. No other rocks are so hard. They are very valuable. It might cost thousands and thousands
They sparkle and glitter in the light. No other rocks are so hard. They are very valuable. It might cost thousands and thousands
admin
2010-02-20
28
问题
They sparkle and glitter in the light. No other rocks are so hard. They are very valuable. It might cost thousands and thousands of dollars to buy just one. Most are found in the ground. The largest ore ever discovered is as big as a man’s fist. But most are tiny.
They’re diamonds!
For hundreds of years men have risked their lives searching for diamonds. To many the discovery of this glittering treasure has seemed more important than the discovery of new lands. Fairy stories tell of brave knights who battled fierce dragons and evil wizards to win kingdom rich with diamonds. In the Tower of Ion- don in England, there is a very special room protected by guards. There, inside a thick glass case, are jeweled crowns once worn by kings and queens. People from all over the world come to see the shimmering diamonds and other precious stones that shine from behind the glass.
Most diamonds seem to flash with a kind of white fire. But there are diamonds that sparkle in other colors, too. Sometimes diamonds are discovered in gravel at the bottom of rivers and streams. (To get these diamonds, the gravel is sucked up through giant hoses that act like vacuum cleaners.) Diamonds are found in rivers, on land, and in great stretches of hot desert sand. A few small ones are even found or near meteorites that strike the ground from outer space.
But most diamonds are found in rocks deep inside the diamond mines of Africa. The diamonds were made millions and millions of years ago when flaming volcanoes melted a mineral called carbon which was a part of these rocks. Gigantic earthquakes shook the rock and pressed them tightly together. The hot melted carbon in the rock squeezed at the same time--squeezed so tightly that by the time it cooled, it had changed into the lovely hard gems called diamonds.
To get at these valuable diamond rocks, workers ride in an elevator that goes down and down into the blackness far below the ground. Tunnels connect this deep shaft with the openings--called pipes--inside the ancient volcanoes.
When they are first dug from the mines, diamonds don’t glitter or sparkle as they do when we see them in rings or other jewelry. They look more like dull bits of glass. A man who knows all about diamonds--a diamond cutter--must cut them just right. Diamonds are so hard that nothing can cut them except the edge of an- other diamond.
Using his diamond-edged tools, the diamond cutter carefully removes tiny pieces so that the diamond will have many sharp edges and smooth surfaces--like little windows. It is because of these shaft edges and smooth surfaces that the diamond reflects light, sparkles and flashes with tiny bursts of color, and seems almost ablaze with fire. Diamond cutters often use diamond saws. The fine powder--diamond dust--that is left after the sa- wing is done can be used in a kind of sandpaper to polish the sparking gems.
Not all diamonds are clear enough or pretty enough or large enough to be made into jewelry. But because they are so hard, they can be used for other things, such as points for drills and needles for record player. These diamonds are called industrial diamonds. Some of them are man made. Carbon is heated until it is hot and then squeezed. If men ever learn how to make it hot enough and to squeeze it tightly enough, they will probably be able to make big diamonds. Then maybe diamonds will be cheap enough to use as buttons on your shirt or coat! (610)
The following are the characters of diamonds EXCEPT ______.
选项
A、they sparkle and glitter in the light
B、they are very hard
C、they are very valuable
D、they are tiny
答案
D
解析
事实细节题。关于钻石的特点在文章一开始作者就给予了介绍,四项似乎均有提到,但是文中又说到大多数钻石很小,但迄今所发现的最大一颗钻石有拳头那么大,因此D项是本题的正确答案。
转载请注明原文地址:https://kaotiyun.com/show/i4vO777K
0
专业英语八级
相关试题推荐
A、Amarathon.B、Aconference.C、Anoutdoormusicfestival.D、Buildingrenovation.B
A、Employeescanreceiveperiodicpayincreasesbasedontheirwork.B、Thesalaryforthepositionisabovetheindustryaverage.
ItissaidthatinEnglanddeathispressing,inCanadainevitableandinCaliforniaoptionalSmallwonder.Americans’lifeexpe
Initseverydaylife,Italyisverymuchtheman’sworld.However,becauseoftheItalian’sunderstandingofforeigners,thewom
Ifyouintendusinghumorinyourtalktomakepeoplesmile,youmustknowhowtoidentifysharedexperiencesandproblems.Your
Wecanbeginourdiscussionof"populationasglobalissue"withwhatmostpersonsmeanwhentheydiscuss"thepopulationproble
TheParisAirShowbroughtAirbus425bookingsworthtensofbillionsofdollars,awelcomedistractionfromtroublesatthepla
AlongWashingtonState’srockycoastlineandinlandwaters,thered-and-whitepatrolboatsandhelicoptersoftheUnitedStates
Thousandsofteachersattheelementary,secondary,andcollegelevelscantestifythattheirstudents’writingexhibitsatende
随机试题
社会心理学家舒茨提出的人际需要三维理论,他提出了三种基本的人际需要是()。
下列不属于总成本领先战略作用的是()
严重腹泻患者常引起
A.呕吐物无胆汁B.呕吐物有多量胆汁C.呕吐物为粪臭样D.呕吐物为血性E.呕吐物呈溢出性幽门梗阻()。
根据下列资料,回答下列问题。据统计,2013年某省完成货运量305830万吨,比上年增长14.8%;完成货物周转量12407.08亿吨公里,比上年增长26.9%。2013年,某省各类运输业务货运量完成最多的是()。
进行相对定向时,需要同名像点个数为()。
会计数据基本的输出形式是()。
阅读材料,并回答问题。材料:郭老师为幼儿园新创设了活动区“美美理发店”。有一天“理发师”晨晨忙着给“顾客”丽丽剪头发,由于“理发店”只有一位顾客,“理发师”妮妮则拿着“剪刀”呆呆地坐在椅子上发愣,郭老师在旁看了一会儿走了。突然,晨晨跑过来对郭老师说
处在互联网时代,中小型民营书店虽然无法在出版规模、价格、渠道等方面和大型发行集团、出版社、传媒集团展开竞争,但可以专注于某一特色,______,市场空间小而利润不小。网络的传播与沟通效应、数据平台的挖掘分析能力,能够帮助独立书店更便捷地触及到读者的思想和需
简述斯腾伯格关于短时记忆信息提取方式的三种假设及研究成果。(2016年)
最新回复
(
0
)