首页
登录
职称英语
The speaker mainly discusses ______. [br] [originaltext] In the early 1800s
The speaker mainly discusses ______. [br] [originaltext] In the early 1800s
游客
2023-11-08
10
管理
问题
The speaker mainly discusses ______. [br]
In the early 1800s, the paper industry was still using rags as its basic source of fiber as it had for many centuries. However, the rag supply couldn’t keep up with the growing demand for paper. The United States alone was using 250 thou sand tons of rags each year. And a quarter of that had to be imported. It was clear that a new source of fiber was needed to keep up with the demand for paper. The answer to this problem turned out to be paper made from wood pulp, something that was abundantly available in North America. In Canada, the first wood pulp mill was set up in 1866, and it was immediately successful. But while wood pulp solved the problem of quantity, it created a problem of quality. Wood contains a substance called lignin. The simplest way to make large quantities of cheap paper involves leaving the lignin in the wood pulp. But lignin is acidic and its presence in paper has shorted the life expectancy of paper from several centuries for rag paper to less than a century for paper made from wood pulp. This means that books printed less than a hundred years ago are already turning yellow and beginning to disintegrate, even though books printed much earlier may be in fine condition. This is bad enough for the older books on your bookshelf, and it poses a huge problem for libraries and the collections of government documents, too.
选项
A、people wanted higher quality paper
B、paper made from rags deteriorated too quickly
C、wood pulp had become too expensive
D、the supply of rags was insufficient
答案
D
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/3167978.html
相关试题推荐
Accordingtothenews,whatdidNOThappentoUSeconomy?[br][originaltext]
Accordingtothenews,whatdidNOThappentoUSeconomy?[originaltext]Con
Whywastheman’sbodydugupfromaMuslimcemetery?[originaltext][29A]
Thespeakermainlydiscusses______.[br][originaltext]Intheearly1800s
Thespeakermainlydiscusses______.[br][originaltext]Intheearly1800s
Thespeakermainlydiscusses______.[br][originaltext]Intheearly1800s
Whatdopeopleknowaboutearlydolls?[originaltext]Nobodycaneverknoww
WhereisthetownofSanJuanCapistrano?[br][originaltext]M:So,Rebecca,wh
WhereisthetownofSanJuanCapistrano?[br][originaltext]M:So,Rebecca,wh
WhereisthetownofSanJuanCapistrano?[br][originaltext]M:So,Rebecca,wh
随机试题
中医(TraditionalChineseMedicine)是世界医学的遗产。中医在很多方面要优于西医。因为其效果和医治方式,现在中医在世界上越来越流行
"OrientationSession"[img]2012q1/ct_etoefm_etoeflistz_1393_20121[/img][br]Wha
电力系统由()组成。Ⅰ.发电厂;Ⅱ.电力网;Ⅲ.变配电系统;Ⅳ.电力用户A.
为了突出表示钢筋的配置状况,在构件的立面图和断面图上,轮廓线用中或细实线画出,图
关于建设用地使用权的特征,说法正确的有( )。A.主体是符合法定条件的公民和法
以下对于保障舞台设施设备安全描述不正确的是()A.受委托舞台工程企业应当获得演出
网络文学兴起之时,互联网是一片全新天地,在线写作带有拓荒性质。那些早期网文作者,
偿债能力分析是通过计算公司各年度( )等,结合公司的现金流量状况、在银行的资信
需求是指消费者在某特定时期内和一定市场上,在每一价格水平上愿意并且能够购买的某种
能够及时了解设备制造过程质量的真实情况,审批设备制造工艺方案,实施过程控制,进行
最新回复
(
0
)