TOEFL Listening: ETS-TOEFL听力机经 - 847BFG3QFJ43L046P$

What is the lecture mainly about? A. The damaging effect of autoradiography on pigments in Rembrandt's paintings B. Conflicting results obtained from different methods of analyzing Rembrandt's works C. Scientific efforts to protect Rembrandt's works from deterioration D. Scientific techniques that helped to reveal Rembrandt's working methods