S6. In mobile American society, interclass and interfaith marriages are becoming________.

A．English husbands usually do a lot of housework.
B．English husbands are usually interesting.
C．English husbands are good at sports.
D．English husbands enjoy doing housework.

A．The new technology used to build roads.
B．The ability to transport goods over land.
C．The trade in grain and cotton.
D．The linking of smaller local roads into one long road.