A:She's in the room.
B:He's in the bedroom.
C:We'll swim in the sea.
已知命题p:x>0,y>0,q:xy>0,则命题p是命题q的( )条件.
如图,AB=AD,AE平分∠BAD,则图中有( )对全等三角形.
炎热的夏天,食物很容易变馊,主要的原因是 ( )