（英语类学生必做）
Have you ever seen a movie in which a building was burned down or a bridge was 【61】 ？ Have you seen a film in which a train crashed or a ship sank 【62】 the ocean？ If so, you 【63】 how these things could happen without 【64】 the people in the film.
The person 【65】 knows the answer is the " special-effect" person. He has one of the most important jobs in the film 【66】
In a 【67】 for one movie there was a big glass bowl filled 【68】 water in which small fish were swimming. The director of the movie wanted the fish to stop swimming suddenly 【69】 they seemed to stare at an actor. Then the director wanted the fish to stop 【70】 and swim away. But fish can't be ordered to do anything. It was quite a 【71】
The special-effect person thought 【72】 this problem for a long time. The 【73】 was an idea for controlling the fish with a 【74】 use of electricity. First, he applied electricity 【75】 the fish bowl, causing the fish to be absolutely still. Then he rapidly reduced the 【76】 of electricity, allowing the fish to swim away. 【77】 he got the humorous effect that the director wanted.
【78】 special effects require training, skill, and experience. It also adds a great deal 【79】 the expense of producing the film. It helps explain 【80】 so many movies are expensive to make.
(86)

A. destroyed
B. collapsed
C. jammed
D. decreased