請認真閱讀下面短文,並根據短文內容回答問題Themaincharacteristicofabirdisfeat...
問題詳情:請認真閱讀下面短文,並根據短文內容回答問題Themaincharacteristicofabirdisfeathers.Nootheranimalhasfeathers.Otherimportantfeaturesforbirdsarewingsandhollowbones.Birdsflybyflappingtheirwingsandusi...
問題詳情:請認真閱讀下面短文,並根據短文內容回答問題Themaincharacteristicofabirdisfeathers.Nootheranimalhasfeathers.Otherimportantfeaturesforbirdsarewingsandhollowbones.Birdsflybyflappingtheirwingsandusi...