Fairy stories are a means by which children's impulses may be______.

A．these labor-saving machines were also independent from any power-driven engines
B．since these inventors were northerners, the textile industry became more prosper- ous in the north than in the south
C．these machines replaced one another and the frequent renewal of implements caused the rapid development of the wool and cotton weaving industries
D．with the invention of these machines substituting for the former labor-consuming ones, the textile industry was revitalized

A．fairy stories are still being made up
B．there is confusion about different kinds of truth
C．people try to modernize old fairy stories
D．there is more concern for children's fears nowadays