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
37
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://kaotiyun.com/show/OQJK777K
0
专业英语四级
相关试题推荐
Jobsatisfactionisabusinesstermthatreferstoaperson’scontentmentwithhisorherjob.Numerousfactorscan【C1】______to
AccordingtotheU.N.EnvironmentProgram,goodmanagementofchemicalscouldprotect______.
MostpeopleknowtwothingsaboutCorsica;Napoleonwasbornhereanditwasthehauntofbandits.Thefirstiscorrect;thesec
Foryears,JorgeDelPinal’sjobasassistantchiefoftheCensusBureau’sPopulationDivisionwastofitpeopleintoneat,distin
ThecoldandrainyweatherinParishasnotstoppedJoeSchaeffer,anAmericantouristfromMilwaukee,Wisconsin,fromvisitingth
Withthebreakneckspeedatwhichtoday’sbusinessesmove,there’sonemantrawe’dalldowelltoremember:Changeisconstant.
AnAustralianresearchgroupmayeasehumanity’scollectiveconscienceoveraspateofprehistoricextinctionsonthesouthernc
Wehavebeenhearing______accountsofyourwork.
Thecountrywasonthevergeofbecomingprosperousandsuccessful.Theunderlinedpartmeans______.
Hisgreatest______ishisutterlynaturalandprofoundlygoodmusicalinstinct.
随机试题
竞选委托可以采取()的形式。
工程竣工验收报告经发包人认可后28天内,承包人未能向发包人递交竣工结算报告等资料,造成工程竣工结算不能正常进行或工程竣工结算价款不能及时支付的,则()。
下列不属于地面土建工程的是()。
2014年3月8日,多成公司在证券交易所以存出投资款2400000元购入甲公司股票30万股(每股面值1元)作为交易性金融资产,另支付手续费50000元。2014年4月22日,甲公司宣告发方2013年度现金股利每股0.1元,多成公司于2014年5月15
甲股份有限公司(以下简称甲公司)为了建造一栋厂房,于2001年11月1专门从某银行借入5000万元(假定甲公司向该银行的借款仅此一笔),借款期限为2年,年利率为6%,利息到期一次支付。该厂房采用出包方式建造,与承包方签订的工程合同的总造价为8000万
推进农村改革发展需遵循的重大原则有()。
我国经济体制改革的目标是()。
近代中国派遣第一批留学生是在()。
在当代中国,坚持发展是硬道理的本质要求就是
Scientificevidencefromdifferentdisciplinesdemonstratesthatinmosthumansthelefthemisphereofthebraincontrolslangua
最新回复
(
0
)