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
28
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
last——lasting
解析
本题为形容词误用。last表示“最后的”但此处并没有强调先后;lasting表示“永久的,持久的”指塑料的定型。
转载请注明原文地址:https://jikaoti.com/ti/gQpYFFFM
0
专业英语八级
相关试题推荐
WHO,workingcloselywithitsMemberStates,otherUnitedNationsagenciesandnongovernmentalorganizations,isfocusingonma
DiscussionoftheassimilationofPuertoRicansintheUnitedStateshasfocusedontwofactors:socialstandingandthelossof
WHO,workingcloselywithitsMemberStates,otherUnitedNationsagenciesandnongovernmentalorganizations,isfocusingonma
Somepeoplebelievethatinternationalsportcreatesgoodwillbetweenthenationsandthatifcountriesplaygamestogetherthey
A、allcountriesreportedprogresstowardfreedomB、onlyafewcountriesmadeprogresstowardfreedomC、freedomtookholdinmany
Jealousy’sPurposeGoodmorning,everyone.Today’slecturewillfocusonacommonpsychologicalproblem—jealousy.Evolutionar
Scienceisacumulativebodyofknowledgeaboutthenaturalworld,obtainedbytheapplicationofaparticularmethodpractised
A、ChairmanoftheSocialScienceSocietyB、ChairmanoftheNaturalScienceSocietyC、ChairmanoftheEnvironmentalWorkSociety
A、allrightB、wrongC、naturalD、objectiveB
随机试题
Homer(霍纳)综合征的表现,不含
《刑事诉讼法》规定,下级法院接到最高法院执行死刑的命令后,发现有关情形时,应当停止执行,并且立即报告最高法院,由最高法院作出裁定。下列哪些情形应当适用该规定?()
背景某公司承包了一条单跨城市隧道,隧道长度800m,跨度15m,地质条件复杂。设计采用浅埋暗挖法进行施工,其中支护结构由建设单位直接分包给一家专业施工单位。施工准备阶段,某公司项目部建立了现场管理体系,设置了组织机构,确立了项目经理的岗
()对于服务相当于婚姻对于()
政策制定的原则主要有()、民主参与原则等等。
220,130,70,34,(),10。
2013年,重庆市房地产开发企业完成投资突破3000亿大关,达3012.78亿元,同比增长20.1%,较一季度回落5.2个百分点,比上半年回落7.6个百分点,比前三季度回落0.5个百分点。截至12月月底,全市商品房施工面积26251.89万平方米,同比增
某校学生参加秋游,如果每台车坐60人,则调15台车还不够,若每台车坐70人,则调14台车还空余。最后决定改乘面包车,每台可坐x人,只需调x台车正好坐满,共有多少师生参加秋游?
A、Gardeningandlandscaping.B、Retailing.C、Financing.D、Child-care.A在听到前文的gardeningandlandscaping时应竖起耳朵听清下文,接着又听到表示最高级信息的req
A、Shemissedthebus.B、Shecaughtthebus.C、Shegotupfiveminutesearlierthanusual.D、Shelikesgettingupearlyinthemo
最新回复
(
0
)