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
39
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、books are in poor condition
B、having too many books from the early 1800s
C、not having enough space to store government documents
D、having to import most of the paper they use
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3167980.html
相关试题推荐
What’sthenewsabout?[br][originaltext]Whenyouheartheword"biodegrada
What’sthenewsabout?[originaltext]Whenyouheartheword"biodegradable,"
Accordingtothenews,whatdidNOThappentoUSeconomy?[originaltext]Con
Whywastheman’sbodydugupfromaMuslimcemetery?[br][originaltext][
TowhichcountrydotheRodong-1missilesbringthemostthreat?[originaltext]
Thespeakermainlydiscusses______.[br][originaltext]Intheearly1800s
Thespeakermainlydiscusses______.[br][originaltext]Intheearly1800s
Whatdopeopleknowaboutearlydolls?[br][originaltext]Nobodycanever
WhatwassaltusedtodoinEgyptthousandsofyearsago?[br][originaltext]
WhatwassaltusedtodoinEgyptthousandsofyearsago?[br][originaltext]
随机试题
TheGrowthofCulturalConsciousness1.ThefirststageNou
Isyourfamilyinterestedinbuyingadog?Adogcanbeahappy【36】toyourf
某病患者8人的潜伏期如下:1、3、3、3、4、5、6、39,则平均潜伏期为()
挡土墙后的填土作用在墙背上的压力称为被动土压力。
女性,42岁。胸背部疼痛半月。胸椎MRI发现硬膜下有一个圆形肿物,界限清晰,呈T
A.自然铜B.雄黄C.芒硝D.滑石E.赭石质较软而细腻,条痕呈白色的是
根据投资建设项目的特点,建设项目内部控制强调的主要目标是()。A:遵守国家有关
下列属于企业不得解除劳动合同的情形有()。A.女职工在孕期、产期、哺乳期 B
某男性患儿,8岁。远中深龋洞,叩诊无异常,牙龈正常,牙齿无松动。去腐干净,龋深,
在无法通过设计达到本质安全时,为了消除危险,应补充设计安全装置。设计安全装置时必
最新回复
(
0
)