题目选项分析

The voice box has been a subject of considerable investigation among researchers studying the origins of language because they have believed for a long time that if humans did not have a low larynx, the use of vocal language was always impossible.

The voice box has been a subject of considerable investigation among researchers studying the origins of language because they have believed for a long time that if humans did not have a low larynx, the use of vocal language was always impossible.