首页
登录
职称英语
[originaltext]Moderator: Good evening, everyone! It’s a great honor of us
[originaltext]Moderator: Good evening, everyone! It’s a great honor of us
游客
2023-08-17
49
管理
问题
Moderator:
Good evening, everyone! It’s a great honor of us to have Professor Johnson here. As we all know, Professor Johnson is an expert of the paper industry. Today he will talk about the development of paper. Let’s welcome Professor Johnson.
Professor Johnson:
Thank you for the introduction. Ok, now I begin the lecture.
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.(16)The United States alone was using 250 thousand 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.(17)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.(18)But lignin is acidic and its presence in paper has shorten 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.(19)This is bad enough for the older books on your bookshelf but it poses a huge problem for libraries and the collections of government documents.
16. Why did the paper industry need a new source of fiber in the early 1800s?
17. What can be inferred about the first wood pulp mill in Canada?
18. According to the speaker, what is the problem with lignin?
19. According to the speaker, what problem do libraries face?
选项
A、Publishers 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
文章开篇提到“The UnitedStates alone was using 250 thousand tons ofrags each year.And a quarter of that had to beimported.It was clear that a new source of fi—ber was needed to keep up with the demand forpaper.”由此可知寻找新材料的原因是布料不足。
转载请注明原文地址:https://tihaiku.com/zcyy/2934959.html
相关试题推荐
[originaltext]Everyyear,peopleinAmericauseenergyequaltoover30mil
[originaltext]Everyyear,peopleinAmericauseenergyequaltoover30mil
[originaltext]Everyyear,peopleinAmericauseenergyequaltoover30mil
[originaltext]Ifsheernumbersprovideanyproof,America’suniversitiesar
[originaltext]Youprobablyknowwhatamobileis,butthemobileI’mtalkin
[originaltext]W:Iwonderifyoucouldtellmealittlebitaboutyourjobasa
[originaltext]W:Iwonderifyoucouldtellmealittlebitaboutyourjobasa
[originaltext]W:Charles,asasinger,doyouevermakeyourselfcrywhenyous
[originaltext]W:Charles,asasinger,doyouevermakeyourselfcrywhenyous
[originaltext]W:I’msofrustratedwiththisnewcomputerprogram.Ijustcan’t
随机试题
下面你将听到一段有关中英关系的介绍。女士们,先生们:英国以其灿烂的文化、众多的发明创造为世界文明和进步作出了巨大的贡献,也对中国社会的发展产
某高度为k的完全二叉树中,所含叶子结点的个数最少为()。
A. B. C. D.
引起红细胞绝对性增多的因素不包括A.大面积烧伤 B.法洛四联症 C.新生儿
手捻试验主要测定细粒土的()。A.强度 B.塑性 C.粒度成分 D.密实度
下列描述正确的是:()A.变异系数是标准偏差与算术平均值的差值 B.变异系数
法洛四联症患儿急性脑缺氧发作时应采取的体位<P>A.平卧位<br>B.半卧位<b
德育工作的出发点是()。 A.德育意义B.德育内容 C.德育目标D.德
李某和丁某交换不等值的房屋,丁某支付给李某差价100万元,则针对这超出的100万
10kg患儿,腹泻后精神萎靡,皮肤弹性差,四肢稍凉,尿量明显减少,CO2CP为1
最新回复
(
0
)