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
" Copy the ways of nature," we were told. Yes, copy nature — for everything comes directly or indirectly from natural things. Of
" Copy the ways of nature," we were told. Yes, copy nature — for everything comes directly or indirectly from natural things. Of
admin
2016-11-21
81
问题
" Copy the ways of nature," we were told. Yes, copy nature — for everything comes directly or indirectly from natural things. Often we have to put our knowledge to work, "treating" nature’s materials so as to make them serve our purposes better. We could, certainly, take the skin from a dead animal and at once make a pair of shoes with it: but they wouldn’t be very good shoes. For ourpurpose it is better first to treat the skin with chemicals that turn it into leather.
Until fairly recently our efforts to copy nature’s methods of manufacture were not very successful. Up to about 1950 only animal skins provided material for good shoes. Clothes had to be made of cotton from the cotton plant or of wool from sheep. The only kind of rubber we had came from the rubber tree. Close study of all such useful materials showed that their chemistry was simple in some ways, most complicated in others. Their basic chemicals are plentiful — and surprisingly similar: that is the simple part. It is the arrangement of their atoms in groups, and the way these groups are stung together in long "chains", that is so complicated. Nature’s methods of combing atoms are what make her materials so varied and so suited to her purposes.
From about 1930 chemists worked hard at the job of getting groups of atoms to combine in long chains. The "raw materials" they used were mainly the gases from coal and later from oil: and the chief means employed were heat and pressure. Some gases proved very active, combing readily, and combing with other gases too. The experiments were successful. A number of "new" materials were made.
Nylon was one of these new materials: nylon stockings first appeared in 1939. Other kinds of plastics followed — some in the form of soft thread(for clothing), strong hair-like threads(for brushes), glass-like material(for bottles)... All were man-made materials, man-made for man’s purposes, not for Nature’s. And because man made them, he could vary them to suit each new purpose as it arose. One of the gases is the starting material for a kind of rubber that, when used in motorcar tyre, prevents the tyres from slipping easily on wet roads. The plastics industry is no longer new. It has grown into the giant petrochemical industry, producing for our needs not only plastics but a wide range of cleaning materials, paints, fertilizers ... the list is long and growing longer. Nature is beginning to look like a slow and limited manufacturer.
Why is it often necessary for us to treat nature’s materials?
选项
A、An animal’s skin can be made into a pair of shoes for us.
B、Our purposes are not necessarily those of Nature.
C、There aren’t enough natural materials for our needs.
D、We try to copy nature — but it is difficult to do that.
答案
B
解析
事实细节题。通过第一段,尤其是Often we have to—our purposes better.这一句可以看出。A,C,D均不符合题意。
转载请注明原文地址:https://www.kaotiyun.com/show/OQJK777K
0
专业英语四级
相关试题推荐
Jobsatisfactionisabusinesstermthatreferstoaperson’scontentmentwithhisorherjob.Numerousfactorscan【C1】______to
Whatistheaimoftheday-longevent?
Whichofthefollowingsentenceshasasubjectcomplement?
AfterreadinganarticleintheHeraldaboutmemorylossanddementia,Icanassurereadersthattoday’sgenerationhasbeeninf
Foryears,JorgeDelPinal’sjobasassistantchiefoftheCensusBureau’sPopulationDivisionwastofitpeopleintoneat,distin
Nearly60millionvisitorsflocktothe384nationalparksacrossAmericaeveryyear.Andyouwon’thavetowanderfarfromhome
Nearly60millionvisitorsflocktothe384nationalparksacrossAmericaeveryyear.Andyouwon’thavetowanderfarfromhome
We______torefundyourmoneyifyouarenotsatisfiedwithyourpurchase.
ThanksgivingTheAmericanThanksgiving,bylawonthefourthThursdayofNovember,/hasalongtraditionintheUnitedStat
A、Themeansoftransport.B、Thelivingcosts.C、Thelivinghabit.D、Thepaceoflife.D本题考查细节。由句(8)可知,男士告诉女士,她面临的最大变化将是生活节奏的改变,因
随机试题
关于氧疗,哪一项是错的?
新生儿女婴过期产,出生体重4公斤,二个月后黄疸没完全消退,哭声低哑,手脚凉,吃奶慢,脐疝,便秘,大便6~7天一次,可能是哪种疾病
诉讼费用的结算
甲公司于2012年2月10日签发一张汇票给乙公司,付款日期为同年3月20日。乙公司将该汇票提示承兑后背书转让给丙公司,丙公司又将该汇票背书转让给丁公司。丁公司于同年3月23日向承兑人请求付款时遭到拒绝。根据票据法律制度的规定,丁公司向甲公司行使追索权的期限
我国第一个五年计划主要指标提前完成的时间是()。
根据下列材料,回答下面问题:某地区的全年财政收入完成6.97亿元,完成年度计划的110.6%,按可比口径计算比上年增长20.6%。其中营业税2.89亿元,增长18.9%,占全区财政收人的41.5%,拉动财政收入增长8个百分点;房产税1.2亿元,增
“将在外,君命有所不受”是句古话,表示承担重大军事任务的指挥员有获得不受约束的随机处置权。现代社会的许多场合中,组织的管理者也有类似的要求。请问具备以下哪个最本条件时,按上述规则行事才会有利于组织发展而不会给组织带来消极后果?______
(2010年单选42)2007年12月31日,甲被人打伤,但直至2008年4月30日,甲才得知凶手是乙。2008年12月5日至2008年12月14日,甲因所在地发生地震,一直无法与外界联系。甲向人民法院起诉不丧失胜诉权的最后日期是()。
TheCaseoftheDisappearingFingerprintsOneusefulanti-cancerdrugcaneffectivelyerasethewhorlsandothercharacteris
A、Physics.B、Mathematics.C、Environmentalscience.D、Lifescience.A
最新回复
(
0
)