When we think of green buildings，we tend to think of new ones—the kind of modern，solar-paneled masterpieces.But the US （1）hashas （have） more than 100 million existing homes，and it would be incredibly wasteful to tear them all down.
An enormous amount of energy and （2）resourcesresources （resource） went into the construction of those houses.And it would take （3）anan average of 65 years for the reduced carbon emissions from a new energy-efficient home to make up for the resources （4）lostlost （lose） by destroying an old one.So in the broadest sense，the （5）greenestgreenest （green） home is the one that has already been built.But at the same time，nearly half of US carbon emissions come from heating，cooling （6）andand powering our buildings.They can't deal with climate change without dealing （7）withwith existing buildings.
The oldest homes tend to be the least energy-efficient，mainly due to the tiny cracks and gaps that expand over time and let in more outside air.
（8）FortunatelyFortunately （fortune），there are a vast number of relatively simple changes （9）that/whichthat/which can green older homes.And efficiency upgrades can save more than just the earth；they can help protect property owners from （10）risingrising （rise） power costs.
【考点】人与自我．
【答案】has；resources；an；lost；greenest；and；with；Fortunately；that/which；rising
【解答】
【点评】
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发布：2024/5/27 14:0:0组卷：2引用：1难度：0.4
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