A:2
B:3
C:2或-3
D:2或3
“I don't think it's my ________ that the window suddenly broke. I just opened it, that's all,” said the boy in tears.
当今社会的许多问题引起世界人民的共同关注。如图漫画中这位母亲关心的是( )
下列现象中,属于凝华现象的是( )