如图,▱ABCD中,点E是边AD的中点,EC交对角线BD于点F,则EF:FC等于( )
There is a sofa (沙发)in this room. We chat (聊天)with each other and watch TV in this room. It's a____.
盛夏北京、天津有很多人喜欢到秦皇岛旅游,是因为( )