{{i}}{{B}} quEstions 17 to 20 ArE BAsED on thE Following monologuE ABout EnErgy ConsErvAtion. you now hAvE 20 .sEConDs to rEAD quEstions 17 to 20.{{/i}}{{/B}}

why is insulAtion rEquirED in nEw housEsA．to limit DisCussion on hEAting Bills.
B．to prEvEnt hEAt loss.
C．to DEtErminE thE tEmpErAturE in homEs.
D．to ConvErt homEs to ElECtriC hEAt.