第6部分：完形填空
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。
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 v（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）．
