以秦岭—淮河为界的是( )
A:暖温带与亚热带
B:中温带和暖温带
C:半湿润与半干旱区
D:半干旱与干旱区
如图,在△ABC中,两条中线BE,CD相交于点O,则S△DOE:S△DCE=( )
Helen has picked up French and can speak fluently after a short stay with her aunt in Paris.