A:magazines
B:directions
C:suggestions
D:messages
如图,在▱ABCD中,E是CD的中点,AE的延长线与BC的延长线相交于点F.
求证:BC=CF.
“大河向东流哇,天上的星星参北斗哇”。大河东流反映了( )
― It's a fine day, isn't it?
― Yes. Why not ____ (go) fishing in the country?