If you are _______ of something you do not know it is happening.

Have you ever seen a movie in which a building was burned down or a bridge was destroyed? Have you seen films in which a train crashed or a ship sank into the ocean? If so, you may have wondered now these things could happen without harming the people in the film.

The man who knows the answer is the "special-effects" man. He has one of the most important jobs in the film industry. He may be ordered to create a flood or made a battlefield explode. And he may also be asked to create a special effect which is much less exciting, though just as important to the success of the film.

In a scene for one movie there was a big glass box filled with water in which small fish were swimming. The director of the movie wanted the fish to stop swimming suddenly while they seemed to stare at an actor. Then the director wanted the fish to stop staring and swim away. But fish can't be ordered to do anything. It was quite a problem.

The special-effects man thought about this problem for a long time. Then there occurred an idea for controlling the fish with a harmless use of electricity. First he used electricity to the fish bowl, causing the fish to be completely still. Then he rapidly reduced the amount of electricity, allowing the fish to swim away. Thus he got the humorous effect that the director wanted.

1. In movie making, a special-effects man ________ .

A. Does the most important job

B. always creates exciting effects

C. finds ways to create something untrue

D. cheats the audience in a special way

2. The example in the passage tells us that ________ .

A. the movie is on how fish live in a big glass box

B. something happened between the fish and an actor

C. a special-effects man makes the fish move actively

D. it takes a special-effects man a long time to work out a scene

3. In order to make the scene real, a simple action in a movie is probably ________ .

A. of great expense

B. the success of the film

C. formed by chance

D. hard to work out