It's almost eight years we _______ each other last time.
A:since; saw
B:before; see
C:after; will see
D:when; have seen
Mr. Jackson keeps lots of __________ on his farm.
古人云:“橘生淮南则为橘,生于淮北则为枳,叶徒相似,其实味不同。”这种差异形成的主要原因是( )
如图,在△ABC中,DE∥AB分别交AC,BC于点D,E,若AD=2,CD=3,则△CDE与△CAB的面积的比为____.