题目内容：

Answer the questions IN COMPLETE SENTENCES:

In 1826, a Frenchman named Niepce needed pictures for his business. But he was not a good artist. So he invented a very simple camera. He put it in a window of his house and took a picture of his garden. That was the first photo.

The next important date in the history of photography was in 1837. That year, Daguerre, another Frenchman, took a picture of his reading room. He used a new kind of camera in a different way. In his picture you could see everything very clearly, even the smallest thing. This kind of photo was called a Daguerreotype.

Soon, other people began to use Daguerre's way. Travelers brought back wonderful photos from all around the world. People took pictures of famous buildings, cities and mountains. In about 1840, photography was developed. Then photographers could take pictures of people and moving things. That was not simple. The photographers had to carry a lot of film and machines. But this did not stop them. For example, some people in the United States worked very hard. Mathew Brady, a famous American photographer, was one of them. He took many pictures of great people. The pictures were unusual because they were very lifelike（栩栩如生）. Photography also became one kind of art at the end of the 19th century. Some photos were not just copies of the real world. They showed some feelings, like other kinds of art.

1.Why did Niepce invent the first camera?

2.According to this passage, how many important dates were there in the history of photography?

3.In the early days, photographers didn't feel like taking pictures of moving things because they had to carry a lot of film and machines, did they?

4.How were the pictures taken by Mathew Brady?

5.Why do people think photography had become a kind of art by the end of the 19th century?