We observed an electromagnetically induced transparency signal in a four-level system with optically selected rubidium atoms at specific velocities in a room-temperature vaporized cell. Since the atoms behave like cold atoms in the selected atomic view, the observed signals coincide with a trapped atomic system. According to this result, we can observe Doppler-free signals, which correspond from 1.2 to 1.0 K in a Doppler-broadened medium. And the selected atoms have velocity components of \ifmmode\pm\else\textpm\fi{}(131 \ifmmode\pm\else\textpm\fi{} 3) MHz per wave number. Our experimental results can provide insight for research in cold media.