Naturally occurring "experiments" with so-called "wolf-children," "bear-children" or "monkey-children" and other such feral youngsters have been widely reported for hundreds of years. None of these children could speak or understand speech and, indeed, most efforts to teach them language ended in failure. The failure accounts for the ______ feature of language.
A、Arbitrariness
B、Duality
C、Cultural transmission
D、Displacement 无解析