题目内容:
HowaretheresidentsintheZEHcommunitiesbilledforelectricityuse?
A.Theyareonlychargedfortheamountofpowertheyconsumeonrainydays. B.Theyneedn'tpayasinglecentfortheirpowerconsumptiononsunnydays.
C.Theyonlypayfortheexcesspowerthatflowsintotheutility'spowergrid.
D.Theypayfortheelectricityfromthegridlesstheirhome-generatedpower.
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答案解析: