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
专升本
When aluminum was first produced about a hundred and fifty years ago, it was so difficult to separate from the ores(矿石) in which
When aluminum was first produced about a hundred and fifty years ago, it was so difficult to separate from the ores(矿石) in which
admin
2007-12-30
64
问题
When aluminum was first produced about a hundred and fifty years ago, it was so difficult to separate from the ores(矿石) in which it was found that its price was higher than that of gold. The price remained high until a new process was discovered for refining the metal with the aid of electricity approximately three quarters of a century later. The new method was so much cheaper that aluminum became practical for many purposes, one of which was making pots and pans.
Aluminum is lightweight, rustproof and easily shaped into different forms. By mixing it with other metals, scientist have been able to produce a variety of alloys, some of which have the strength of steel but weigh only one third as much.
Today, the uses of aluminum are innumerable. Perhaps its most important use is in transportation. Aluminum is found in the engines of automobiles, in the hulls of boats. It is also used in many parts of airplanes. In fact, the huge "airbus" planes would probably never have been produced if aluminum did not exist. By making vehicles lighter in weight aluminum has greatly reduced the amount of fuel needed to move them. Aluminum is also being used extensively in the building industry in some countries.
Since aluminum is such a versatile(多用的) metal, it is fortunate that bauxite(铝土矿) , which is one of its chief sources, is also one of the earth’s most plentiful substances. As the source of aluminum is almost inexhaustible, we can expect that more and more uses will be found for this versatile metal.
Aluminum is______.
选项
A、lightweight, rustproof but not easily shaped into different forms
B、heavyweight, rustproof and easily shaped into different forms
C、lightweight, rustproof and easily shaped into different forms
D、lightweight and easily shaped into different forms but it is easy to become rusty
答案
C
解析
根据文章第二段第一句中的(铝的重量轻、防生锈、易成形)所以选择C。A项 的意思不全,只说了其两个特征:重量轻,不易生锈;B项heavyweight(重量较重),所以错;D项的意思“重量轻、容易被塑成不同的形状,但容易生锈”,所以D项错。
转载请注明原文地址:https://kaotiyun.com/show/thLC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
IrecentlywroteanautobiographyinwhichIrecalledmanyoldmemories.Oneofthemwasfrommyschooldays,whenourninthgra
IrecentlywroteanautobiographyinwhichIrecalledmanyoldmemories.Oneofthemwasfrommyschooldays,whenourninthgra
A、fakirspossessmagicpowerB、IndiansarenotafraidofpainC、peoplecanlearntocopewithpainD、somepeoplearebornwithou
Doyoufindgettingupinthemorningsodifficultthatit’spainful?Thismightbecalledlaziness,butDr.Kleitmanhasanew
不言而喻,科学技术的发展对中国现代化是至关重要的。
Iwasadvisedto______myflightnumberatleast24hoursinadvancewhenIwasvisiting-Paris.
Atthebeginningofthissemester,ourhistoryprofessor______alistofbooksforustoread.
IfonereadsAagreatmanyarticlesinElementaryEnglish,ByouwillbecomeCfamiliarwiththeproblemsoftheDbeginningteache
Inthetraditionalmarriage,themanworkedatajobtoearnmoney.Mostmenworked.Sincethemanearnedthemoney,hepaidthe
Itisonlyashiny,yellowmetal,butitisoneofthemostvaluablemetalsonearth.Sincethebeginningoftime,menhavelook
随机试题
在国际支付中,最常使用的汇付方式有___________、___________和___________三种。
酶偶联间接连续监测法,选择指示酶的原则,说法错误的是
通常不会引起张口受限的间隙感染是()
下列关于以公允价值计量且其变动计入其他综合收益的金融资产为债务工具投资的表述中,错误的是()。
企业发生的下列外币业务中,即使汇率变动不大,也不得采用即期汇率的近似汇率进行折算的是()。
“精卫填海”“夸父逐日”等神话故事出自作品()。
下列关于“一带一路”的说法不正确的是:
1924年我国第一本《教育心理学》教科书出版,它的作者是()
某种产品的商标为“MAXAM”,其中有两个字母脱落,有人捡起随意放回,求放回后仍为“MAXAM”的概率.
在SQL查询中“GROUPBY”的含义是()。
最新回复
(
0
)