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  3. In 1983, when oil prices were still high in my area, I installed a ground-source heat pump in my brand-new, well-insulated, 1,60

In 1983, when oil prices were still high in my area, I installed a ground-source heat pump in my brand-new, well-insulated, 1,60

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问题      In 1983, when oil prices were still high in my area, I installed a ground-source heat pump in my brand-new, well-insulated, 1,600-square-foot house. It cost several thousand dollars more than comparable systems that use oil, gas or wood, but I figured I’d recover my higher initial expense m a few years through lower energy bills.
     True, my heat pump runs on electricity -- an expensive commodity where I live. But most of its energy comes from the earth, a propylene-glycol solution circulates through 1,200 feet of two-inch-diameter plastic pipe buried three feet deep in a field next to my house. As it travels, the solution absorbs heat from the surrounding soil, even when soil temperature drops below freezing.
     My ground-source heat pump also offers important benefits that have nothing to do with economics.
   -- Minimal fire hazard -- no chimney, firebox, or heating elements -- only pumps, fans, and a compressor.
   -- Cleanliness -- no combustion products, thus no chance of my heating system polluting the indoor air, leaving scummy deposits on walls and furniture.
   -- Reliability -- solid-state electronic controls and sealed bearings almost eliminate breakdowns.
   -- No maintenance -- no wood to cut, ashes to haul, or chimney to clean.
   -- Convenience -- The system runs automatically, even switching from heating to air conditioning as needed. I can simply lock the door and go away for a day, week or month.
     Not only did I expect to start saving on energy costs immediately, but I also expected those savings to grow over the years as oil prices continued to soar. Since I was wrong about oil prices, the big dollar savings I’d hoped for haven’t materialized. Nevertheless, I am satisfied, all things considered.
According to the passage, the author’s heat pump requires ______
选项 A、no maintenance
B、very little maintenance
C、only a yearly check of controls
D、no more maintenance than an oil burner
答案A
解析 本题是细节题。文中明确写到“No maintenance"，因此正确答案一目了然。
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