第6部分：完形填空（第51～65题，每题1分，共15分）
阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案，涂在答题卡相应的位置上。
Save Energy at Home
On the average，Americans waste as much energy as two-thirds of the world’s population consumes.That’s largely the 51 of driving inefficient cars，using inefficient appliances（设备），and living and working in poorly insulated（隔热）buildings.Then what can you do to 52 the situation？
Buy energy-efficient products—buy new appliances or electronics of the highest energy-efficiency rating.New energy-efficient models may cost more initially，but have a lower operating 53 over their lifetimes.The most energy-efficient models 54 the Energy Star label，which identifies products 55 use 20-40 percent less energy than standard new products. According to the EPA（美国环境保护署），the typical American household can save about$400 per year in 56 bills with products that carry the Energy Star.
Switch to compact fluorescent bulbs（荧光灯）—change the three bulbs you use 57 in your house to compact fluorescents.Each compact fluorescent bulb will keep half a ton of CO2 out of the air 58 its lifetime. 59 ，compact fluorescent bulbs last ten times as long and can save$30 per year in electricity costs.
Set heating and cooling temperatures correctly—check thermostats（温度自动调节器）in your home to make sure they are 60 at a level that doesn’t waste energy.Turn off lights and other electrical appliances such as televisions and radios when you’re not 61 them.Install automatic timers for lights that people in your house frequently 62 to turn them off when leaving a room.Let the sunshine in—the cheapest and most energy-efficient light and heat source is often right outside your window.On 63 days，open blinds（百叶窗）to let the sun light your home for free.Also remember that 64 entering a room equals passive solar heating.Even on cold winter days，sun streaming into a room can raise the temperature by several 65 .
51.A.power B.result C.way D.work
52.A.improve B.create C.face D.explain
53.A.speed B.system C.cost D.profit
54.A.carryed B.bring C.take D.give
55.A.where B.while C.that D.since
56.A.phone B.water C.food D.energy
57.A.less B.most C.rarely D.seldom
58.A.about B.with C.on D.over
59.A.Moreover B.However C.Therefore D.So
60.A.corrected B.turned C.set D.reduced
6l.A.covering B.using C.repairing D.leaving
62.A.want B.have C.try D.forget
63.A.bright B.rainy C.foggy D.dark
64.A.air B.rain C.wind D.sunlight
65.A.layers B.levels C.degrees D.points