A.具一對(duì)門齒 B.門齒終生生長(zhǎng) C.無(wú)犬齒 D.吻端細(xì)長(zhǎng)
A.肺 B.皮膚 C.肝臟 D.腸
A.犀牛 B.河馬 C.馬鹿 D.長(zhǎng)頸鹿