属于家庭外在结构的是
A．角色
B．权力
C．经济来源
D．沟通形态
E．价值取向
参考答案：C
My sister doesn't like bread. She won't eat it ____________she is very hungry. [ ]
A. if
B. when
C. as
D. unless
护杆铁板，按其形状有（）和（）两种。
A.瓦形
B.扁形
C.条形
