TOEFL Listening: ETS-TOEFL听力机经 - HY439KXC5048BVV5P$

According to the professor, what was Alexander Calder's most significant contribution to the art world? A. He produced an impressive range of both painting and sculpture. B. He used a new material to create his sculptures. C. He proved that engineers could be artists as well. D. He showed how sculpture could involve movement