2013年12月英语四级选词填空实例训练(23)

　　2013年下半年，英语四级将改革，局部题型发生变化。选词填空在英语四级考试中，是考生们很难逾越的难关，很多考生做到这类题型都会选择直接放弃。其实，只要大量练习，再加上归纳总结，选词填空拿高分并不难。下面小编整理了选词填空题型训练，希望对考生们有帮助。　　When we think of green buildings, we tend to think of new ones-the kind of high-tech, solar-paneled masterpieces that make the covers of architecture magazines. But the US has more than 100 million existing homes, and it would be 47 wasteful to tear them all down and 48 them with greener versions. An enormous amount of energy and resources went into the construction of those houses. And it would take an average of 65 years for the 49 carbon emissions from a new energy-efficient home to make up for the resources lost by destroying an old one. So in the broadest 50 , the greenest home is the one that has already been built. But at the same time, nearly half of US carbon emissions come from heating, cooling and 51 our homes, offices and other buildings. "You can't deal with climate change without dealing with existing building," says Richard Moe, the president of the National Trust.　　With some 52 , the oldest homes tend to be the least energy-efficient. Houses built before 1939 use about 50% more energy per square foot than those built after 2000, mainly due to the tiny cracks and gaps that 53 over time and let in more outside air.　　Fortunately, there are a 54 number of relatively simple changes that can green older homes, from 55 ones like Lincoln's Cottage to your own postwar home. And efficiency upgrades (升级) can save more than just the earth; they can help 56 property owners from rising power costs.

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