题目内容：
请根据短文的内容，回答题。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 sun shine in--the cheapest and most energy-efficient light and heat source is often fight 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 __________ (56).
__________ A．power
B．result
C．way
D．work
参考答案：
答案解析：