B

In the 1500s，the camera was invented．

However，in the early 1800s people found a way to make the picturespermanent．Even then，photography was a new field． Most families had their pictures taken by photographers．People did not own cameras because taking pictures and developing the films were too difficult．In 1884 ，George Eastman invented a kind of film．lt could be put into a small camera． The new film was easy to use． So many people began to buy cameras． When they had used up their films people returned their cameras to the factory． There，the films were developed，and pictures were made． More films were put into the cameras． And they were sent back to the owners with their pictures．

Today's cameras are much easier to use． Photography has become a hot hobby， There are also many new jobs in this field，especially in news reporting． Newspapers，magazines，and tele-vision all need pictures to tell stories， Photographers help scientists by taking pictures through microscopes and telescopes． Deep-sea divers take pictures of ocean plants and animals． Astro-nauts take their cameras into space． Man finds new uses of the camera every day．

(    )26． When did people find a way to make the pictures permanent?