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
60
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、wood pulp was of good quality
B、wood pulp was very cheap
C、rags were not enough
D、rags could not be obtained in the U. S.
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/lB2K777K
0
专业英语四级
相关试题推荐
1 Peoplehavebeenpaintingpicturesforatleast30,000years.Theearliestpictureswerepaintedbypeoplewhohuntedanimals
Joewenttocourtbecausehewasa______.
HowmanyexhibitsdoesOldShoesMuseumhave?WhichofthefollowingcanNOTbeseeninsidetheaquarium?
Whydoesthehonestpublichavetopayhigherpriceswhentheygototheshops?Accordingtothepassage,law-abidingcitizens
Americansthisyearwillswallow15,000tonsofaspirin,oneofthesafestandmosteffectivedrugsinventedbyman.Themostpo
Jeancouldbeaveryattractivegirlbutshe________toherclothes.
Whatisthemainpurposeoftheconversation?
Itishardtoimaginealargecitywithoutpolicemen,butsuchwasthe______inLondonintheearly18thcentury.
Threehourshaspassedsincetilediscussionwasbegun,andI’mafraidtheywill______itstilllonger.
ThefaceoftheMoonischangedbycollisionswithmeteoroids,______newcraterstoappear.
随机试题
低渗性缺水补液的原则为()
三羧酸循环中草酰乙酸主要补充来自于
在询问出血性疾病病人的病史时应包括
心包炎中最常见的病因是
患儿,6岁。泄泻1天,泻下稀薄如水注,粪色深黄臭秽,夹有少量黏液,腹部时感疼痛,食欲减退,恶心欲吐,口渴引饮,舌红苔黄腻。其证候是
某幢高层写字楼建设项目,业主委托某监理单位进行施工阶段(包括施工招标)监理。该工程邀请甲、乙、丙三家施工企业进行总价投标。评标采用四项指标综合评分法。四项指标及权数分别为:投标单位的业绩与信誉0.10,施工管理能力0.15,施工组织设计合理性0.2
( ),税务机关可以对其核定应纳税额。
在一个人力资源信息系统中有多个子系统。这些子系统可以按此相连,也可以没有关系,使用者可以根据特殊需要对系统加以设计。这种类型的人力资源信息系统属于()系统。
一代伟人邓小平经常妙语连珠,下列语录按出现时间先后排列正确的是:①“一个国家,两种制度”②“解放思想,实事求是,团结一致向前看”③“中国的对外政策是独立自主的,是真正的不结盟”④“改革开放胆子要大一些,看准了就大胆地
A、 B、 C、 D、 D
最新回复
(
0
)