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  3. Sally Kemmerer has,so far,escaped Northern California’s rolling blackouts. But up on the roof for her Oakland home,workers a

Sally Kemmerer has,so far,escaped Northern California’s rolling blackouts. But up on the roof for her Oakland home,workers a

admin2012-07-18  40
问题     Sally Kemmerer has,so far,escaped Northern California’s rolling blackouts.
    But up on the roof for her Oakland home,workers are tapping into,perhaps,the most reliable power source,the sun. It could mean no more worries about blackouts or power rates.
    Sally Kemmerer,homeowner says, "I hope that we’ll be able to zero out,you know,our electric bill. I mean that’s definitely our goal."
    Turning the sun’ s rays into electricity is,of course,nothing new.
    But California’s power crisis has cast a new light on the technology.
    Gary Gerber.a solar power contractor,says,"I might have been getting,say three phone calls a week a couple of months age. I’ m getting six a day now, it’ s completely crazy."
    Alternative energy is even more attractive,thanks to a state rebate program. So far this month,California’ s energy commission has received 200 project applications. That is more than the number of applications all last year.
    Putting in a solar roof is still a relatively expensive proposition. This project cost around 45,000 dollars. Even taking into account the state subsidy of 12,000 dollars,that leaves a net cost to the homeowner of around 33,000 dollars.
    Sally says,"We were happy to find out that,eventually,the system should pay for itself,you know 20-years, maybe."
    Aaron Wellendorf has had a p-v (or photovoltaic generator) for more than a year. Like most solar systems,his is not off the grid completely the utility still kicks in at night,or when there’ s no sun. But when there is bright light,things change.
    Wellendorf says,"I’m turning my meter backward with extra power that I’m generating." Backward? That’s right! Wellendorf’s meter tracks how much power goes back into the utility grid. Last year all the paid for electricity was a service charge. That charge was around five dollars a month.
    In fact,even after powering his super-efficient household appliances and his converted electric track, Wellendorf generated a net surplus of more than 2000-kilowatt hours.
    Unfortunately,state law doesn’t require the utility to pay him for that. Wellendorf says,"I don’t get it in money, I just get the satisfaction of helping out the power grid."
    And,he gets the satisfaction of being energy self-sufficient.
In a month of work days (approximately 20),how many calls could the solar contractor expect if this current rate continues unchanged?
选项 A、60
B、30
C、150
D、120
答案D
解析 本题的依据句是文中第六段的“I’m getting six a day now”。从中可知，每天6个电话，一个月6×20=120。因此正确答案为D。
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