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
A、It turned out high-quality paper. B、It used wood imported from the United States. C、It caused a serious deforestation problem.
A、It turned out high-quality paper. B、It used wood imported from the United States. C、It caused a serious deforestation problem.
admin
2016-10-18
32
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、It turned out high-quality paper.
B、It used wood imported from the United States.
C、It caused a serious deforestation problem.
D、It obtained success soon.
答案
D
解析
由“In Canada,the first woodpulp mill was set up in 1866 and it was immediately successful.”可知加拿大第一个纸浆厂迅速成功。
转载请注明原文地址:https://kaotiyun.com/show/NBF7777K
0
大学英语六级
相关试题推荐
Manynewmotherssufferfromextremetirednessevenfourmonthsaftergivingbirth,promptingexpertstowarntheyshouldnothu
AllChange[A]Thebasicmodeloftheelectricityindustrywastosendhighvoltagesoverlongdistancestopassivecustomers.Po
A、Manypeoplecomeforthewriter.B、Themanrarelycomestothemall.C、Theyarenotfansofthewriter.D、Thewomandoesn’tha
Angeroftenmakesusuncomfortable.It’suncomfortabletowitnessanduncomfortabletofeel.Witnessingyourchild’sangercanb
A、Themuseummightbeclosedbeforetheyarrive.B、Theyshouldfindadifferentwaytogettothemuseum.C、Hewon’tbeableto
A、Shewon’tbeabletogetthebookbeforeclass.B、Thebookstherearetooexpensive.C、Shehopestogetagooddealonsomese
A、Theirabilitytosurviveisdiminished.B、Theirbodytemperaturegoesdown.C、Theirabilitytodigestfoodimproves.D、Theirl
A、Thedeanoftheartschool.B、TheeditorofCeramicsMonthly.C、Askilledpotter.D、Astudentinthepotteryclass.C在文章开始之前,考
A、Thehighsalary.B、Thefreecollegetuition.C、Thechancetomeetpeople.D、Theopportunityforadvancement.C说话者谈到,这份工作的好处是可以
A、Anxiety.B、Truth.C、Sympathy.D、Time.A从“worried”,“can’tsleep”,“anxiety”,“stress”这些意思接近的关键词不难推断,这段对话的主题是焦虑。因此选A。
随机试题
指导行为产生的是()
男性,30岁。浅Ⅱ度烧伤面积40%,创面大量液体渗出,脉速,尿少,比重高。以上表现符合下述哪项护理诊断
治疗痰湿中阻之眩晕的主方应选
资源开发利用的合理性主要分析()。
小张从A电器城购买一款B厂生产的电热壶(电器城事先未声明此商品没有质量问题),他在放置一年后将其拿出来使用,正常使用过程中因电热壶爆炸而受伤住院,共花费医疗费2500元。小张出院后立即就自身的损害向法院提起诉讼。问:(1)小张可以以何种事由提起诉讼?
我国人民代表大会制度的优越性有()。
2013年第一季度,我国船舶进出口总额78.54亿美元,同比下降27%。其中船舶产品出口总额为72.91亿美元,同比下降29.6%。1—3月,我国船舶产品出口中出口数额最大的船型是散货船,出口额达到36.8亿美元,在船舶产品的总体出口中占比50.
当代知名的服装设计大师们,绝大部分还没从服装设计学校毕业就已经离开学校,开始自己的服装设计生涯。因此,服装设计的专业学习对学生们今后的职业发展并没能提供有力的帮助。以下哪项能够最好地反驳上述推论?
设反常积分收敛.证明:反常积分绝对收敛.
软件测试是软件质量保证的主要手段之一,测试的费用已经超过了(1)的30%以上,因此提高测试的有效性十分重要。“高产”的测试是指(2)。根据国家标准GB8566—88计算机软件开发规范的规定,软件开发和维护划分为8个阶段,其中单元测试是在(3)阶段完成的;
最新回复
(
0
)