A．Servants in America are hard to get．
B．She can hardly afford servants．
C．She takes pride in what she can do herserf．
D．It is easy to prepare a meal with canned food．
A．A Respectable Serf-Made Family
B．Americans' Attitude toward Manual Labor
C．Characteristics of American Culture
D．The Development of Manual Labor
A．Happiness could be produced．
B．Happiness is human's birthright．
C．Happiness can be copied．
D．Happiness is infectious．