电影里逼真的3D特效是怎样产生的?
Have you ever tried to “touch” things when you see a 3D film? They look so real! Our world has three dimensions: depth, width and height. But a 2D film only has height and width. All the action is on the big screen. 3D films add depth. That makes you feel as if you are part of the experience.
Try this: hold up a pen in front of you. Close one eye and look at it. Now close the other eye. What do you see? The pen moves a little bit! Our eyes and brain work together to make us see in 3D. 3D films do the same thing. With 3D glasses, each of our two eyes sees a different image. Then our brain puts the two images together, so we see the film in 3D.
Now you know how 3D works. Would you like to watch a 3D film with me?
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1.What is 3D?
A It refers to a kind of film.
B It refers to three dimensions.
C It refers to all the action on the big screen.
D It refers to all the images on the big screen.
解析：选B。细节理解题。根据第一段第三句Our world has three dimensions: depth, width and height.可知，我们的世界有三维：长、宽和高，故选B。
2.What is the difference between 3D and 2D?
A 3D is fast.
B 2D is slow.
C 3D adds depth.
D 2D is less than 3D.
解析：选C。细节理解题。根据第一段第四句But a 2D film only has height and width.和第五句3D films add depth.可知，2D只有高度和宽度，而3D增加了深度，故选C。
3.What can we learn from Paragraph 2?
A Our eyes move.
B The pen moves.
C Our brain moves.
D The pen doesn’t really move.
解析：选D。推理判断题。根据第二段Our eyes and brain work together to make us see in 3D.可知，钢笔并不是真的动了，而是我们的眼睛和大脑共同作用的效果，故选D。
4.How do 3D films work?
A Our eyes see one thing, and our brain thinks the other.
B One eye sees an image, and the other sees the same image.
C Without 3D glasses, each of our two eyes sees the same image.
D Our two eyes see a different image, and our brain puts them together.
解析：选D。细节理解题。根据第二段最后两句With 3D glasses, each of our two eyes sees a different image. Then our brain puts the two images together, so we see the film in 3D.可知，用3D眼镜，我们每只眼睛都能看到不同的图像，然后我们的大脑把这两幅图像放在一起，所以我们看到了3D电影，故选D。