TOEFL Listening: TPO-TOEFL听力TPO - 4GQG1Q7FUEH1ZP70R$

What is the main purpose of the lecture? A. To explain how musicians can perform successfully in theaters and concert halls with poor acoustics B. To explain how the design of theaters and concert halls has changed over time C. To discuss design factors that affect sound in a room D. To discuss a method to measure the reverberation time of a room