A．It is fast widening across most parts of America．
B．It is not a reliable indicator of economic mobility．
C．It is not correctly interpreted．
D．It is overwhelmingly ignored．
A．have placed religious beliefs above party politics
B．have bridged the gap between the rich and the poor
C．offer poor children more chances to climb the social ladder
D．suffer from higher levels of racial and economic segregation
A．Family structure．
B．Racial equality．
C．School education．
D．Community density．
A．It is important to increase the size of the middle class．
B．It is highly important to expand the metropolitan areas．
C．It is most imperative to focus our efforts on the elimination of income inequality．
D．It is better to start from the community to help poor children move up the social ladder．