TOEFL Listening: ETS-TOEFL听力机经 - 5X69BC191NF0IQK1P$

What benefit to painters does the professor emphasize when he discusses the camera obscura? A. Painters could improve their technique by tracing works of more accomplished artists. B. Painters could render their subject matter with greater accuracy. C. Painters could create paintings on a wider variety of surfaces. D. Painters were able to paint portraits and landscapes more quickly.