It can be inferred from the passage thatA. it is necessary to keep the air－conditionin

Itcanbeinferredfromthepassagethat

A.itisnecessarytokeeptheair-conditioningonallthetime

B.itseemspossibleforeveryhouseholdtocutemissionsofCO2

C.theaverageUShouseholdproducesabout3,000poundsofCO2amonth

D.theaverageEuropeanhouseholdproducesabout1,000poundsofCO2amonth