关于Themaincharacteristi的百科

• 请认真阅读下面短文,并根据短文内容回答问题Themaincharacteristicofabirdisfeat...

• 问题详情：请认真阅读下面短文,并根据短文内容回答问题Themaincharacteristicofabirdisfeathers.Nootheranimalhasfeathers.Otherimportantfeaturesforbirdsarewingsandhollowbones.Birdsflybyflappingtheirwingsandusingairpressure(压力)tocreateliftundertheirwings,Jus...
• 2019-02-1319644