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Nowadays, people often watch a movie in the cinema. Do you wonder how the moving picture is made and where the voice, noises and music come from?

A cinema film(胶片) has lots of small photographs, each one of which is different from the one before it. Each photograph is brought in front of a strong light, and there it stops for a very small part of a second. This photograph, therefore, appears on the screen, and we see it.

Then the light is covered and the next photograph is moved to the position in front of the strong light. Meanwhile, the metal cover turns away from the light. Then, the second photograph is shown on the screen. This is done again and again, twenty-four times a second. We see about 86,400 different pictures every hour.

The voices, noises and the music are recorded on the side of the cinema film. The record looks like marks of strange shapes. The side of the film passes in front of another light, and the rays of the light which pass through change as the marks(标记) change. These marks have been made from the voices and other sounds of the people and events before the film is being shown on the screen. The marks may be considered as "printed sounds".

1.Why can we see pictures moving on the screen?

A We see many pictures every hour.

B Each picture is a little different from the former.

C Photographs change quickly.

D Both B and C.

解析：选D。细节理解题。根据第二段可知B和C都正确，故选D。

2.What is the light covered by?

A The screen.

B A metal cover.

C The sound record.

D Marks of strange shapes.

解析：选B。细节理解题。根据第三段第一、二句Then the light is covered and the next photograph is moved to the position in front of the strong light. Meanwhile, the metal cover turns away from the light.可知光被金属盖子盖住，故选B。

3.How many pictures can we see every hour?

A 24.

B 86.

C 1,440.

D 86,400.

解析：选C。C 细节理解题。根据第三段最后一句We see about 86,400 different pictures every hour.可知我们每个小时可看到86400张不同的图片，那么一分钟能看到1440张图片，故选C。

4.Which is TRUE about the sound record?

A It sounds strange.

B It looks like regular marks.

C It is printed in the middle of a film.

D It is made before the film is being shown on the screen.

解析：选D。D 细节理解题。根据第四段倒数第二句These marks have been made from the voices and other sound of the people and events before the film is being shown on the screen.可知在播放到屏幕之前，这些声音的标记已经制作好，故选D。

5.Which of the following is NOT mentioned in the passage?

A Photograph.

B Color.

C Music.

D Voice.

解析：选B。细节理解题。根据全文内容可知，文章没有提到颜色，故选B。