2. 外语
  3. In 1983, when oil process were till high in my area, I installed a ground-source heat pump in my brand-new, and insulated 1,600-

In 1983, when oil process were till high in my area, I installed a ground-source heat pump in my brand-new, and insulated 1,600-

admin2009-01-05  47
问题   In 1983, when oil process were till high in my area, I installed a ground-source heat pump in my brand-new, and 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 in 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 beatings 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 process 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.
The passage suggests that the author’ s heat-pump system absorbs heat from ______.
选项 A、soil in a nearby field
B、sun panels at ground level
C、a pipe buried next to the walls
D、a tank of propylene glycol
答案A
解析 本题是细节题，相对应的原文是“But most of its energy comes from the earth... As it travels，the solution absorbs heat from the surrounding soil...”，由此可见，A是正确的。
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