Virtual reality system is essentially A: believable B: explorable C: interactive D: computer-generated E: immersive

What are the categories of virtual reality system? A: Immersive virtual reality B: Enhanced virtual reality system C: Virtual simulation system D: Desktop virtual reality E: Distributed virtual reality

Which of the following may be an obstacle to develop ecotourism? A: Tourists feel essential to cultivate their environmental awareness. B: Tourists learn to use alternative energy sources and local building materials. C: Tourists may not necessarily follow the local traditions. D: Tourists realize the importance of immersive interactions with local people.