A:1个
B:2个
C:3个
D:4个
I can't connect my computer to the Internet. There must be ______ wrong with it.
下列图示实验操作中,正确的是( )
做膝跳反射实验时,当一个人迅速叩击另一个人膝盖下面的韧带时,小腿会突然抬起,请回答下列问题:
“一国无二君,一庙无二祭主”,反映了西周宗法制的突出特点是( )