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
Plastics are materials which are softened by heat and set into last form 1.______ when are shaped in a mold. Some are natural; s
Plastics are materials which are softened by heat and set into last form 1.______ when are shaped in a mold. Some are natural; s
admin
2011-07-28
33
问题
Plastics are materials which are softened by heat and set into last form 1.______
when are shaped in a mold. Some are natural; some are semi-synthetic, the 2.______
result of chemical action on natural substance; some are synthetic, built up
from the constituents of oil or coal. All is based on the chemistry of carbon, 3.______
with its capacity of forming chains. The molecules that compose them 4.______
(monomers) link together in the setting or curing process to form chains
(polymers), which give plastics their flexible strength. Some plastics retain
their ability to be softened and reshaped; as wax, they are thermoplastic. 5.______
Others set permanently in the shapes they are given by heat and pressure;
like bags, they are thermosetting.
From industrial beginnings in nineteenth century, plastics have 6.______
struggled through a hundred and twenty years of glory, failure, disrepute
and suspicion on the slow road to public acceptance. Now, at last, one can
positively say that plastics are appreciated and enjoyed for what they are;
that they make modern life rich, more comfortable and convenient, and 7.______
also more fun. Plastics are warm materials, sympathetic with the human 8.______
touch, and their transformation into things that come into contact with human
beings is entirely appropriate.
The fact there are plastic antiques comes as a shock to most people. 9.______
How can a material that seems so essentially twentieth century, and one
that is so much associated with cheap, disposed products, has a history 10.______
at all? It is a young technology, and a great part of the fun of collecting
plastics is that beautiful pieces of historical interest can still be found very
cheaply.
选项
答案
fact∧一that
解析
本题为从句误用。此处在fact后引导的说明性从句为同位语从句,同位语从句的引导词that不可以省略。
转载请注明原文地址:https://kaotiyun.com/show/bcYO777K
0
专业英语八级
相关试题推荐
LeacockwasprobablythefirstCanadiantoqualifyasa"pro-AmericanBritishimperialist."Acolleague,Prof.JohnCulliton,sa
Countriesatalllevelsofeconomicdevelopmentfaceasimilarchallenge:tomaketheirindustriescompetitiveinanincreasingl
InChina,manystudentsatseniorhighschoolaredividedintothosewhopursuestudiesinartsorthoseinsciences.Someeduca
AMarxistsociologisthasarguedthatracismstemsfromtheclassstrugglethatisuniquetothecapitalistsystemmthatracial
Whilethepercentageofurbanresidentsishigherinrelativelydevelopedcountries,developingcountrieshaveanincreasingnum
A、allcountriesreportedprogresstowardfreedomB、onlyafewcountriesmadeprogresstowardfreedomC、freedomtookholdinmany
Jealousy’sPurposeGoodmorning,everyone.Today’slecturewillfocusonacommonpsychologicalproblem—jealousy.Evolutionar
A、blowupanapartmentbuildingintheU.S.B、gainaccesstosufficientnaturalgasandexplosivesC、prepareforaterroristat
Thedestructionofournaturalresourcesandcontaminationofourfoodsupplycontinuetooccur,largelybecauseoftheextreme
Thedestructionofournaturalresourcesandcontaminationofourfoodsupplycontinuetooccur,largelybecauseoftheextreme
随机试题
把沟通分为单向沟通和双向沟通,这种划分标准是()
下列属于计算机安全维护的有()
糖皮质激素对血细胞的作用有
A、山莨菪碱B、毒扁豆碱C、后马托品D、贝那替嗪E、新斯的明感染中毒性休克可选用
面部的运动神经是
对于贷款发放的具体流程,下列说法错误的是()。
实施职工内部退休计划的,企业拟支付的内退职工工资和缴纳的社会保险费等,应在职工内退后各期分期确认因支付内退职工工资和为其缴纳社会保险费等产生的义务。()
小学教育心理学
_______是学校文化的缩影。
A、 B、 C、 D、 A多值依赖的定义是:设R(U)是属性集U上的一个关系模式,X,Y,Z是U上的子集,并且Z=U-X-Y、关系模式R(U)中的多值依赖X→Y成立,当且仅当R(U)的任意关系r给定的一对(x
最新回复
(
0
)