题目内容：
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 1ifetime._____（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 the lights 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 sun shine 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）． A．power
B．result
C．way
D．work
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