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 library of congress in Washington, D.C., which【C1】______ the largest collection of books in the world, is fighting a battle
The library of congress in Washington, D.C., which【C1】______ the largest collection of books in the world, is fighting a battle
admin
2010-02-17
28
问题
The library of congress in Washington, D.C., which【C1】______ the largest collection of books in the world, is fighting a battle against paper deterioration. The【C2】______ of the old books, often yellowed and torn,【C3】______ crumble when they are touched. The main culprit in the battle is the acidic paper that has【C4】______ making books since the nineteenth century.
Air pollution and moisture【C5】______ the problem.【C6】______ , the books that are most【C7】______ destruction are not the oldest books. The paper in books produced【C8】______ the last century was made【C9】______ cotton and linen rags,【C10】______ are naturally low in acid. And the Gutenberg bible,【C11】______ five centuries ago, was made of thin calfskin, and is in【C12】______ good shape. But in the nineteenth century, with widespread literacy bringing a demand for a cheaper and more plentiful【C13】______ of paper, the industry began using 【C14】______ treated wood pulp for making paper.【C15】______ the chemical in these paper that is causing today’s problem. This problem of paper deterioration is one of【C16】______ concern. France, Canada, and Austria are all doing research into the new methods of deacidification. A new technology has been【C17】______ recently, in fact, that allows for mass deacidification of【C18】______ books at the same time. It costs less than microfilming and 【C19】______ preserves books in their original form.【C20】______ there will soon be treatment facilities all over the world to preserve and deacidify library book collections.
【C5】
选项
A、have added to
B、has added
C、added to
D、adding to
答案
C
解析
add to增添,文章主要用现在时,而空气污染和潮湿问题加重,强调了对现在的影响。因此选用现在完成时,因此正确答案是C。
转载请注明原文地址:https://kaotiyun.com/show/NcnK777K
0
专业英语四级
相关试题推荐
PassageOne(1)Arthurwastakentothehugemediaevalfortressattheharbour’smouth.Hefoundprisonlifefairlyendurab
PassageOne(1)Arthurwastakentothehugemediaevalfortressattheharbour’smouth.Hefoundprisonlifefairlyendurab
PassageTwoWhatdidLeahMacleanmainlycomplainabout?
Abroadpublicdiscussionofenvironmentalproblemsbeganinthemid-1980s,whenthefirst"green"groupsformedinopposition
Abroadpublicdiscussionofenvironmentalproblemsbeganinthemid-1980s,whenthefirst"green"groupsformedinopposition
______werereportedbytheweatherstationinChicago.
WhendidRussianPresidentVladimirPutinmeetwithaJapanesebusinessdelegation?
Whatisreportedtohavecausedthedeathofatleast17people?
随机试题
Wouldyouriskyourlifeforacountrythatconsideredyouasecond-classcitizen?Wouldyoujoinamilitarythataskedyoutor
护理质量控制以预防为主。护理部质控组运用PDCA的管理办法,定期到临床进行查找存在问题,在检查中注重要素质量、环节质量和终末质量及发现产生质量问题的原因,针对主要原因定出具体实施计划,贯彻和实施预定的计划和措施,反馈预定目标执行情况,并总结经验教训,将存在
循环冷却水系统通常按循环水是否与空气直接接触而分为()系统。
关于耕地占用税的征收管理,下列说法正确的有()。
放弃可能明显导致亏损的投资项目属于风险对策中的()。
下列选项中,不属于资产类科目的是()。
牛女士的丈夫素来大男子主义观念很严重,去年因车祸失去了双腿,只能以轮椅代步,又失去了工作,情绪非常低落。牛女士包揽了全部家务,悉心照顾丈夫,但是丈夫总是发脾气,甚至有时辱骂牛女士。牛女士感到很无助,向社会工作者李好求助。根据妇女社会工作专业服务的要求,李好
文件系统提供按名存取功能,要求用户在读文件之前调用__________文件操作。
Comparisonsweredrawnbetweenthedevelopmentoftelevisioninthe20thcenturyandthediffusionofprintinginthe15thand1
Technologiescollapsethedistancebetweenadesireanditsfulfillmentbyreducingeitherthetimeortheeffortinvolved.Thi
最新回复
(
0
)