原式=1+（-3）+1-4×12
=1-3+1-2
=-3．
Looks are not ______. It’s what’s inside you that really matters.
A．anything
B．something
C．everything
D．nothing
3岁男孩，Jb电图显示电轴右偏，不完全性右束支传导阻滞，右心室肥大，最可能是哪种先天性心脏病
A．原发孔型房间隔缺损B．继发孔型房间隔缺损C．小型室间隔缺损D．中型室间隔缺损E．动脉导管未闭
