A true friend is a person _________ reaches for your hand and touches your heart.
A:who
B:what
C:which
如图,AC,BD相交于点O,∠A=∠D,请你再补充一个条件,使得△AOB≌△DOC,你补充的条件是____
如图,在▱ABCD中,E、F分别为AB、BC的中点,连接EC、AF,AF与EC交于点M,AF的延长线与DC的延长线交于点N.
如图的三个图形是某几何体的三视图,则该几何体是( )