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
What discovery was the basis of photography?
What discovery was the basis of photography?
admin
2012-08-21
24
问题
What discovery was the basis of photography?
Today,I’ll be talking about the invention of the camera and photography. The camera is often thought to be a modern invention. But as early as 1727,a German physicist discovered that light darkened silver salt, a chemical compound. Using as a camera, a big box with a small hole to let the light in,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 photography he made in 1826 still exists. The painter Dagger improved on the process by placing common salt,the kind we eat,on the metal. 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 photography became truly modern. In 1960’s Matthew Brady was able to take his famous pictures of the American Civil War,thus making portrait poses very popular. In the 20th century,George of the United States simplified film-developing,and Edwards Land invented the so-called instant camera with self-developing film. If we say that the photography came into existence in 1839, it follows that it has taken more than one hundred years for the cameras to reach its present condition of technical refinement.
选项
A、He was a soldier.
B、He took war photographs.
C、He painted portraits.
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/d8wd777K
本试题收录于:
公共英语二级笔试题库公共英语(PETS)分类
0
公共英语二级笔试
公共英语(PETS)
相关试题推荐
______ofuswouldacceptyourfoolishidea.
Hissisteralwaysspendssomuch______clothesthatsheCan’tmanagetolivewithinherincome.
下周一班里要召开大型主题班会,老师让每人准备一份发言稿。请你以MyFuturePlan为题写一篇100词左右的发言稿。提纲如下:1.我决定大学毕业后当一名教师,这是我孩提时代的梦想;2.我很喜欢教师这个职业,与学生在一起可以使自己
Columbusdecidedtoexplorenewareasbecause______.ColumbusDayiscelebratedintheUnitedStateson______.
ChristopherColumbuswasthesonofaweaver.Hewasveryinterestedinthediscoveryofnewlands.HisbrotherBartholomewwas
Helenalwayscomeshomeatweekends,______thecountrytothetown.
Scientistsaroundtheworldhavebeenstudyingthewarm【S1】_____ofwatersinthePacificOceanbeingknownasELNino.
Youarenotallowedtoparkyoucarhere.Ifyou______ithere,Iwillcallthepolice.
FromMondayuntilFriday【36】peoplearebusyworkingorstudying,butintheeveningsand【37】weekendstheyarefreetoenjoythem
Whatdiscoverywasthebasisofphotography?
随机试题
TheUnitedStatesisacountrymadeupofmanydifferentraces.Usuallytheyaremixedtogetherandcan’tbetoldonefromanot
以下哪种避孕方法作用时间长,适用于已有一胎,小孩尚小的妇女
国际金融组织贷款项目招标规定,投标保证金的金额一般不低于估算合同价的()。
在有较大排洪量、地质条件较差、路堤高度较小的设涵处,宜采用()。
根据行为金融学理论,投资者所具有的回避损失和心理会计特征会导致()。
某县教育局局长马某挪用教育经费,建造教育局办公大楼,对于马某,应当依法()。(2015年上半年真题)
试述利率市场化对商业银行的影响。
关于数据库技术的发展历史,下列说明不正确的是
小方正在为本部门报考会计职称的考生准备相关通知及准考证,利用考生文件夹下提供的相关素材,按下列要求帮助他完成文档的编排。新建一个空白Word文档,利用文档“准考证素材及示例.docx”中的文本素材并参考其中的示例图制作准考证主文档,以“准考证.docx
Forsmokers,theworldisanincreasinglyhostileplace.Drivenoutofbarsandotherpublicspaces,smokersarenowtobefound
最新回复
(
0
)