中国大学MOOC: Last year, customers ______ (buy)a total of 90 million iPods and 2 billion songsfrom the iTunes store.

What were students doing before class?: They were browsing Facebook.|They were making phone calls.|They were playing with their iPods.|They were talking to each other.

How have the classrooms been fundamentally changed? A: They have been equipped with modern multi-media teaching facilities. B: Due to the digital information that exists everywhere, people’s old concepts are no longer true. C: Information can be accessed by laptops, mobile phones, and iPods. D: Students can do a lot of things that they couldn’t do in the past.