TOEFL Listening: ETS-TOEFL听力机经 - 4V0JTP5I6G6PW1GBP$

What does the professor emphasize about the play The Adding Machine? A. To point out that it is a surrealist play. B. To prove that it was popular than other expressionistic plays. C. To point out that people sang or danced to express their happiness. D. To point out that it requires few props.