A:What is expected
B:As is expected
C:It is expected
D:What we expect
如图,E、P、F分别是AB、AC、AD的中点,则四边形AEPF与四边形ABCD____ (填“是”或“不是”)位似图形.
法国大革命爆发的根本原因是( )
地球仪上的纬线( )