00:00

Question 62·Medium·Text Structure and Purpose

Throughout much of the twentieth century, linguists assumed that the whistles exchanged in several mountainous villages were merely playful imitations of spoken words. Recently, however, anthropologists analyzing archival and new acoustic recordings determined that the whistles replicate complete syllabic patterns, enabling detailed conversations to carry across deep ravines. After mapping these patterns onto a standard phonetic chart, the researchers proposed that whistle-based speech may preserve features of an earlier spoken dialect that has since disappeared.

Which choice best describes the structure of the paragraph?