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
58
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
PassageThree(1)Youdonotneedtoplayinabandtobepartoftheburgeoning"gigeconomy".Nearlyeveryonehasski
Abroadpublicdiscussionofenvironmentalproblemsbeganinthemid-1980s,whenthefirst"green"groupsformedinopposition
Howmanyattacksandclasheswerereportedinthisnews?
______werereportedbytheweatherstationinChicago.
Whatisdiscussedasanewpartofthemedicalfacilities?
Itisreportedthatthirtypeoplewerekilledina______ontherailwayyesterday.
Itishardtotrackthebluewhale,theocean’slargestcreature,whichhasalmostbeenkilledoffbycommercialwhalingandis
Itishardtotrackthebluewhale,theocean’slargestcreature,whichhasalmostbeenkilledoffbycommercialwhalingandis
Itishardtotrackthebluewhale,theocean’slargestcreature,whichhasalmostbeenkilledoffbycommercialwhalingandis
WhendidRussianPresidentVladimirPutinmeetwithaJapanesebusinessdelegation?
随机试题
男士着装的三大禁忌中不包括_______。
内伤发热属虚的病机为()
患者,男性,38岁,排便后有鲜血滴出。该患者可能患有
依据不同的标准,可以对行政补偿予以不同的分类。根据行政补偿发生的原因不同,行政补偿可以分为()。
房地产经纪机构购买业务保险,属于风险管理的()方法。[2010年考试真题]
北方光源中心的机电工程由某安装公司承包,工程内容有空调工程,仪表工程,光缆工程,BA系统及消防工程。空调系统的洁净度等级设计为N5级,并由BA监控,其传感器、执行器通过DDC与计算机连接。中心的门禁系统采用可以记录员工进出时间的非接触式感应电控锁。仪表设备
桂江公司为甲公司、乙公司、丙公司和丁公司提供了银行借款担保,下列各项中,桂江公司不应确认预计负债的有()。
下列各句中有歧义的一句是()。
板块构造学说是20世纪最重要的科学成果之一,下图为某种类型的板块边界示意图。图示的板块边界是()。
国际储备管理的原则和内容是什么?(对外经贸大学2003年)
最新回复
(
0
)