完形填空。 How 3D Movies Work   . Do you know 3D movies? When you see one, it's like the story l in front of  you, and you are a  part ofit. 3D movies are  exciting to 2 , but do you know how 3 them, and 4 you need to wear a pair of  3D  glasses? To understand these  questions, let's make an easy 5  . O Put a finger 6 your eyes. O Cover your lef't eye and look at the finger. O Cover your right eye and look at the finger. What do you see:l The finger you see with your left eye is in a different position from the one you see with your right eye. This means you get two images(图像) when you look at 7     _ with both your eyes. To makea 3D movie, people have to get two images at the same time, 8_ they use two video cameras.  When playing a  3D movie, they use two projectors (放机) at the same time.  This brings two images together on the screen. Then, we use 3D glasses to separate(识别) the two images. One image enters one eye and 9 enters the other eye. Then our brains 10 the two images together. In this way, we get 3D pictures. (     )1. A. happen (     )2. A. watch (     )3. A. make (     )4. A. when (     )5. A. examl)le (     )6. A. in front of (     )7. A. everything (     )8. A. because (     )9. A. other (     )10.A. let B. happened B. see B. to make B. why B, picture B. in the front of B. anything B. so B. the other B. put C. to happen C. look C. making C. which C. experiment C. behind C. something C. and C. others C. take D. happening D. notice D. made D. what . D. mowe D. beside D. nothing D. but D. the others D. bring