题目内容：
Questionsarebasedonthefollowingpassage. TheGataisusedtofrownwhentheyreceivedpowerbillsthatroutinelytopped$200．LastSeptemberthecouplemovedintoa1,500-square-foothomeinPremierGardens,asubdivisionof95"zero-energyhomes"(ZEH)justoutsidetown．Nowthey'reactuallyeagertoseetheirelectricitybills．Thegrandtotaloverthe10monthsthey'velivedinthethree-bedroomhouse:$75．Forthepasttwomonthstheyhaven'tpaidacent.
ZEHcommunitiesaretheleadingedgeoftechnologiesthatmightsomedaycreatehousesthatproduceasmuchenergyastheyconsun~e．PremierGardensisoneofahaft-dozensubdivisionsinCaliforniawhereeveryhomecutspowerconsumptionby50%,mostlybyusinglow-powerappliancesandsolarpanels.
Asidefromthepanelsontheroof,PremierGardenslookslikeacommunityofconventionalhomes.Butinside,specialwindowscutpowerbillsbyblockingsolarheatinsummerandretainingindoorwarmthinwinter.
Therestoftheenergysavingscomesfromthesolarunits．Theydon'tjustfeedthehometheyserve．Iftheygeneratemorepowerthanthehomeisusing,theexcessflowsintotheutility'spowergr/d(电网)．Theresidentsarebilledby"netmetering":theypayfortheamountofpowertheytapoffthegrid,lessthekilowatts(千瓦)theyfeedintoit．Ifahomegeneratesmorepowerthanituses,thebilliszero.,
Thatsoundslikeabaddealforthepowercompany,butit'snot．Solarhomesproducethemostpoweronthehotsunnyafternoouswheneveryonerusheshometoturnuptheairconditioner．"Ithelpsuslower'usageatpeakpowertimes,"sayssolarexpertMikeKeesee．"Thatletsusavoidbuildingcostlyplantsorbuyingexpensivepoweratpeakusagetime."
What'snottolike?Mostlythecosts．Thespecialfeaturescanadd$25,000ormoretothepurchasepriceofahouse．Taxbreaksbringthecostdown,especiallyinCalifornia,butinmanystatesZEHscanbeprohibitivelyexpensive．Fortheconsumer,it'samatterofpayingnowforthehardwaretosavelaterontheutilities.
hehardwaretosavelaterontheutilities.
WhyaretheGataiseagertoseetheirelectricitybillsnow? A．Theywanttoseehowmuchtheyhavesaved.
B．Theywanttocutdowntheirutility'expenses.
C．Theywanttoknowiftheyareabletopay.
D．Theywanttoavoidbeingovercharged.
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