The following passage is adapted from an article about ancient Greek acoustics. Match each paragraph of the passage to its primary main idea.
[Paragraph 1]
The ancient theater of Epidaurus, constructed in the fourth century BCE, is renowned for its extraordinary acoustics. Visitors standing at the center of the circular performance space, or orchestra, can whisper or tear a piece of paper, and the sound will be clearly heard by spectators sitting in the highest row of limestone seats, some sixty meters away. For decades, scientists and historians wondered whether this acoustic perfection was a result of deliberate design or merely a fortunate accident of geography.
[Paragraph 2]
Recent acoustic research has solved the mystery, revealing that the theater's limestone seats act as a sophisticated acoustic filter. Researchers discovered that the ridged rows of seats suppress low-frequency sounds��such as the rustle of wind or the murmurs of the audience—while reflecting high-frequency sounds from the stage. This filtering effect essentially amplifies the voices of actors and musicians, carrying their performances to the upper tiers of the theater.
[Paragraph 3]
However, this design does have a limitation. While the limestone seats are exceptionally good at transmitting high frequencies, they also suppress the lower frequencies of the actors' voices. To compensate for this loss, ancient actors relied on masks with built-in megaphones and projected their voices with specialized vocal techniques. Thus, the superb audibility was a combined achievement of architectural filtering and the performers' physical adjustments.
- Paragraph 1The description of the theater's legendary acoustics and the historical debate over their origin.
- Paragraph 2The explanation of how the physical structure of the theater filters sound to enhance audibility.
- Paragraph 3The discussion of a drawback in the theater's design and how performers adapted to it.