A:π2,0
B:π4,0
C:π9,0
D:π16,0
如图,已知∠1=∠2,欲证△ABD≌△ACD,还必须从下列选项中补选一个,则错误的选项是( )
I can't read the book by myself because there are ______________ new words in it.
建军节是____