During thE First hAlF oF thE twEntiEth CEntury, thE AvErAgEAmEriCAn housEholD wAs ______ By thE introDuCtion oF A group oF mAChinEs thAt proFounDly AltErED thE DAily livEs oF housEwivEs.
A、trAnsFormED
B、trAnsFErrED
C、trAnsmittED
D、trAnsportED