Read the passage below carefully, and then choose the best answer:
Inside a 4D Film
A lot of people think that 3D films are pretty cool. When you watch a 3D film, it sometimes feels like you can reach out and touch the things that you see. In the future, however, 3D might be replaced by something even more advanced: 4D. What you see in a 4D film is the same as what you see in a 3D film. The screen is the same, and the glasses are the same. 4D films are different because they don’t use 3D technology. People in the audience also feel physical things during the films. Let’s look at a few examples. Let’s say that you are watching a film about earthquakes. If you are watching a 4D film, maybe your seat will suddenly start to shake. It will feel like you are in the middle of an earthquake, but you are not. The 4D effects make your seat shake. Or perhaps during the film, one of the characters gives flowers to another character. The people in the cinema might suddenly smell flowers. The point of 4D films is to make people feel like they are in the film. When we watch films these days, we only use two senses: our sense of sight and our sense of hearing. If we use our other senses, the film might feel more real to us. 4D films already exist. The film Avatar was released everywhere in 3D, but in Korea and Hong Kong, it was also released in 4D. People who watched Avatar in 4D feel wind and rain. They also smelled smoke from the weapons in the film, and sometimes their seats moved. Will 4D replace 3D films? It is possible, but we can’t be sure yet. One problem with 4D films is that it is very expensive to show them in theaters. Before a theater shows a 4D film, it has to buy a lot of special equipment. However, 4 films are catching on. Other films shown in 4D include Shrek 4-D, and Iron Man 3.
3. Which of the following is NOT true about 4D films?
