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、Light darkens silver salt. B、Light darkens natural salt. C、Light darkens silver. D、Light darkens self-developing film. A根据文中“a
A、Light darkens silver salt. B、Light darkens natural salt. C、Light darkens silver. D、Light darkens self-developing film. A根据文中“a
admin
2010-09-25
37
问题
Today, I’ll be talking about the invention of the camera and photography. The invention of the camera and photography changed our lives a lot. The camera is often thought to be a modern invention. But as early as 1727. (26) a German physicist discovered that light darkens silver salt, a chemical compound. Using as a camera, a big box with small hole to let the light in, (26)he made temporary images on the salt. Silver salt is still the base of film today.
Then a French scientist made the first permanent picture by using a special piece of metal sensitized with silver salt. A photograph he made in 1826 still exists. The painter, Daguerre improved on the process by placing common salt on the metal. (27)This was in 1839, the official date of the beginning of photography, but the problem was the printing of the photographs, and it wasn’t until other scientists developed the kind of paper we now use, that good printing was possible and photograph became truly modem.
(28) In 1860s, Mattew Bradey was able to take his famous pictures of the American Civil War. In the 20th century. George Eastman of the United States simplified film developing, and Dr. Edwin Land invented the so-called "instant" camera with self-developing film. If we say that photography came into existence in 1839, it follows that it has taken more than one hundred years for the camera to reach its present condition of technical refinement.
选项
A、Light darkens silver salt.
B、Light darkens natural salt.
C、Light darkens silver.
D、Light darkens self-developing film.
答案
A
解析
根据文中“a German physicist discovered that light darkens silver salt, a chemical compound... he made temporary images on the salt. Silver salt is still the base of film today.”德国物理学家发现了一种化学物质银盐,这种物质可以产生显影。由此推断,摄影的基础是银盐的发现。故正确答案为A。
转载请注明原文地址:https://jikaoti.com/ti/wyeFFFFM
0
大学英语六级
相关试题推荐
A、Microsoft.B、Movie-producers.C、Contentproviders.D、PCusers.C
Directions:Peopleinmodernsocietyliveunderalotofpressure,fromeducation,career,orfamily.Soitisimportantforthe
WhetherChina’shousingreformcanbecarriedonsuccessfullywillhave【S1】______aprofoundbearingonthefutureofther
Idealsabout"spoiling"childrenhavealwaysinvolvedconsiderationofwhataspoiledchildis,howspoilingoccurs,andwhatth
PreparingforTestsIdeallyitshouldbeloveoflearning,achievement,andself-improvementthatpromptsalllearning.But
ScientistssaythewarmingoftheEarth’satmospherehasbeguntoaffectplantandanimallifearoundtheworld.Scientistsfrom
Directions:Forthispart,youareallowed30minutestowriteashortessayentitledMyOpiniononCollegeGraduatesWorkingas
A、Hethinksthelawyerwasrealistic.B、Hethinksthelawyerwasnotdramaticenough.C、Hethinksthelawyerplayedinhispart
A、No,becauseheisanundergraduate.B、No,becauseit’sopenonlytoteachers.C、Yes,ifhe’sawrittenpermission.
Thefilmcostalargesumofmoneybutwasnotwellmade.Itwas______(怪不得观众满怀期望而来),butleftverymuchdisappointed.
随机试题
ARDS最典型的病变是
新生儿时期保健重点错误的是
经审理查明,张三的个人财产只有小店的滞销商品,则李云、综合商店能否要求其以家庭财产履行债务?为什么?李云能否代位行使张三对其小舅子的债权?为什么?
按照我国民诉法规定,有下列情形之一的,可以延期审理________。
给付定金的一方不履行约定债务的,无权要求返还定金;收受定金的一方不履行约定债务的,应当返还定金。()
以下哪些属于心理咨询范围?()
新学期开始不久,我发现班上出现了这么一个现象:当孩子们需要移动小椅子进行活动的时候,总是习惯用一只手拎住椅背拖行,或是把椅背夹在腋下,像拄着拐杖一样一摇一晃地行走。每当这个时候教室里总是充斥着一种椅子在地板上敲打、摩擦的声音,很是刺耳,也不安全。起先是一两
一份稿件,甲、乙、丙三人单独打各需20、24、30小时。现在三人合打,但甲因中途另有任务提前撤出,结果用12小时全部完成。那么,甲只打了几小时?()
设单链表的表头指针为h,链表中结点构造为(data,next),其中data域为字符型,链表长度为n。编写算法判断该链表的n个字符是否中心对称。(例如xyx,xyyx都是中心对称。)
Thefreethingdoesbotherme.NotbecauseIthinkgood-qualitycontentoughttoexistonlyforthosewhocanafforditbutbeca
最新回复
(
0
)