He was ____ (homeless/homelessness), so we took him in.
如图,在▱ABCD中,E是BC的中点,且∠AEC=∠DCE,下列结论不正确的是( )
小玲在家帮妈妈煮饺子,发现开始时生盼饺子会沉入锅底,过一会儿饺子就会上浮,最后煮熟的饺子会漂浮在水面上.请你用浮沉条件的知识解释饺子能上浮的原因.