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 earliest process of making paper was done almost 5,000 years ago in Egypt and the Nile Valley. In those days, paper was made
The earliest process of making paper was done almost 5,000 years ago in Egypt and the Nile Valley. In those days, paper was made
admin
2017-11-17
29
问题
The earliest process of making paper was done almost 5,000 years ago in Egypt and the Nile Valley. In those days, paper was made from strips of the papyrus plant.
Modern paper-making began in China about 2,000 years ago. This process produced paper from cloth, straw, wood or the bark of trees. The raw materials are struck over and over until they become loose. Then they are mixed with water.
After the water has been removed, the flat, thin form remaining is permitted to dry. This becomes a sheet of paper.
Large machines started to be used for making paper near the end of the 16th century. Today, paper-making is a big business. But it is still possible to make paper by hand, since the steps are the same as using big machines.
You should choose paper with small amounts of printing. Old envelopes are good for this reason. Colored paper also can be used, as well as small amounts of newspaper. Small pieces of rags or cloth can be added. These should be cut into pieces about 5 centimeters by 5 centimeters.
Everything is placed in a container, covered with water, and brought to a boil. It is mixed for about 2 hours with some common chemicals and then allowed to cool. Then it is left until most of the water dries up. The substance left, called pulp, can be stored until you are ready to make paper.
When you are ready, the pulp is mixed with water again. Then the pulp is poured into a special box or mold. The mold is made of small squares of wire that hold the shape and thickness of the paper. To help dry the paper, the mold lets the water flow through the small wire squares.
After several more drying steps, the paper is carefully lifted back from the mold. It is now strong enough to be touched.
The paper is smoothed and pressed to remove trapped air. You can use a common electric iron used for pressing clothes.
Whether the paper is strong enough to be touched is determined by_____.
选项
A、how long the pulp is stored
B、how thick the paper is
C、how much water remains
D、what type of chemicals are used
答案
C
解析
倒数第2段提及要经过“多次干燥处理”,才能把纸取出,可见,纸是否足够坚韧以便取出,取决于纸浆中含有的水分的多少,因此,本题应选C。
转载请注明原文地址:https://kaotiyun.com/show/dUa7777K
0
大学英语四级
相关试题推荐
Peopleappeartobeborntocompute.Thenumericalskillsofchildrendevelopsoearlyandsoinexorably(坚定地)thatitiseasyt
Theearliestprocessofmakingpaperwasdonealmost5,000yearsagoinEgyptandtheNileValley.Inthosedays,paperwasmade
Somepessimisticexpertsfeelthattheautomobileisboundtofallintodisuse.Theyseeadayinthenot-too-distantfuturewhe
Itseemstomethattoday’sprime-timeleaderneedsatop-5listthatclearlylaysouthisorherpriorities.Whetheryou’rerun
Searchingforloveisnolongerjustafavoritesubjectforsongs.Ithasalsobecomeahugeindustry.Expertssaythatthe
HintsandTipstoSaveMoneyA)Spendless.Thisisnotoversimplifyingthebestwaytosavemoney!Itisessentialifyoua
Intoday’seconomy,it’stoughenoughbeingarestaurantowner,butnowyouhavetosafeguardyourgarbage,too.FromCalifo
A、Theskillfuluseofgesturesandfacialexpressions.B、Differencesinstylebetweenwritingandspeaking.C、Theimportanceof
A、Hedidnotnoticeit.B、Hedrovetoofasttoreadit.C、Itsays45milesanhour.D、Itisnotclearlyvisible.A根据选项中的notnoti
A、TheyhavetolearnbasicsofEnglish.B、Theyknowclearlywhattheywanttolearn.C、ItisgoodforthemtolearngeneralEngl
随机试题
A、Ithasanumberofactivevolcanoes.B、Ithasanatmosphereliketheearth’s.C、Ithasalargeoceanunderitssurface.D、Ith
缝合面颈部皮肤进针时,针尖与皮肤的关系是
对急性腹痛患者以下说法不正确的是
下列物质中不能使酸性高锰酸钾溶液褪色的是()。
在微机中,访问最快的存储器是()。
企业在资产负债表日前签订的债务重组协议,在资产负债表日后事项期间发生的债务重组结算业务,应对报告年度的财务报表进行调整。()
2018年1月1日,甲公司以银行存款3950万元取得乙公司30%的股份,另以银行存款50万元支付了与该投资直接相关的手续费,相关手续于当日完成,能够对乙公司施加重大影响。当日,乙公司可辨认净资产的公允价值为14000万元。各项可辨认资产、负债的公允价值均与
王老师对学生小张自身的各个方面进行纵横比较,以判断其学习状况的评价属于()。
关于婴儿期脂肪和肌肉发展的规律描述正确的是
"OntheInternet,nobodyknowsyou’readog,"readthetitleofafamousPeterSteinercartoon,【C1】______nowhereisittruerth
最新回复
(
0
)