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
The paper industry needed wood pulp in the early 1800s because ______.
The paper industry needed wood pulp in the early 1800s because ______.
admin
2010-04-24
69
问题
The paper industry needed wood pulp in the early 1800s because ______.
In the early 180Os, 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 thousand tens 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 quantifies of cheap paper involved leaving the lignin in the wood pulp. But lignin is acidic and its presence in paper has shortened 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 the conditions.
选项
A、did not make much money
B、achieved great success
C、produced paper of high quality
D、produced paper of limited quantity
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/qB2K777K
0
专业英语四级
相关试题推荐
Theindustrialsocietieshavebeenextremelyproductiveduringthelasttwocenturies.Theeconomicadvancehasbeenremarkabl
Since1895theNationalTrust(国家文物信托基金会)hasworkedforthepreservationofplacesofhistoricinterestandnaturalbeautyi
Whichofthefollowingstatementsismentionedinthepassage?
Youshould________yourroomnowandthentokeepitsuppliedwithfreshair.
Thehigherthestandardoflivingandthegreaterthenationalwealth,______.
Itishardtoimaginealargecitywithoutpolicemen,butsuchwasthe______inLondonintheearly18thcentury.
Policefiredteargasandarrestedmorethan5,000passivelyresistingprotestorsFridayinanattempttobreakupthelargest
Hildaisatthebicycleshop______.
Inthe1960s,medicalresearchersThomasHolmesandRichardRahedevelopedachecklistofstressfulevents.Theyappreciatedthe
Intheend,itgotabittedious,queuingtoseethemillionaire.Asbefittedourcolour,marshalswavedusthroughtheouterga
随机试题
“重视客户利益,言行诚实守信”是出版物发行员职业道德中关于出版物发行员服务行为的基本要求。()
简述正式沟通的优缺点。
黑脚病是什么中毒的临床表现
1946年,决定将抗战以来实行的减租减息政策改变为消灭封建土地制度,实行耕者有其田的土地政策的文件或者法律是()。
下列关于土地增值税的表述中,错误的是()。
在产品价值评价时,若A、B、C、D四种零件的价值系数分别为VA=0.5,VB=0.8,VC=1VD=1.2,则应重点研究的对象是( )。
对进出口化妆品进行检验是由于化妆品直接和人体接触,对安全和卫生的要求很高。( )
“经营单位”栏应填()。“保费”栏应填()。
下列业务中,仅产生所有者权益内部结构调整的有()。
一艘轮船从河的上游甲港顺流到达下游的丙港,然后调头逆流向上到达中游的乙港,共用了12小时。已知这条轮船的顺流速度是逆流速度的2倍,水流速度是每小时2千米,从甲港到乙港相距18千米。则甲、丙两港间的距离为()
最新回复
(
0
)