— _____ around the world is to learn about the world.
— Yes, it's a good way ____ the world.
A:To travel; to know
B:To travel; know
C:Travel; to know
D:Travel; know
若△ABC∽△DEF,相似比为1:3,则△ABC与△DEF的面积比为( )
①dog____ A.
②elephant ____ B.
③girl ____ C.