专四专八考试

【单选题】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 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 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 best title for the passage is ______.A．Preparing the Ground for a Pump System
B．Pros andCons of the Ground-Source Heat Pump
C．The Ground-Source Heat Pump
D．It Works for Me!

网考网参考答案：D
网考网解析：
[精解] 大意判断题。询问全文的主旨，因此分析全文的结构有助于解题。文章第一段讲了“我”装置“the groundsource heat pump”的目的所在，接着介绍了装置的优点，最后一段表明了“我”的态度，即“我”对此装置还是比较满意的，因此，四个选项之中只有D全面地概括了文章的中心内容。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>