家庭生活周期分为几个阶段（）
A.4个阶段
B.6个阶段
C.8个阶段
D.10个阶段
E.以上均不是
参考答案：C
In a family, ______ really works is ____ there is one person who understands the finances and takes care of it.
A．that; what
B．what; that
C．it; that
D．as; that
机器单采浓缩白细胞悬液保存最佳温度为（）。
A.2～6℃
B.6～8℃
C.20～24℃
D.24～28℃
E.37℃
