TOEFL Listening: ETS-TOEFL听力机经 - 9DE905EVTYK8ZPW4P$

What is the main purpose of the lecture? A. To propose arguments for and against a theory of social change B. To show how social change has affected trends in European painting C. To discuss a theory about the relationship between art and social change D. To show how theories regarding the causes of technological innovations have developed over time