5. 答案

　　B

　　解析

　　推理判断题。根据最后一段第二句If you were one of those drivers who found your fare paid，who knows what you might have been inspired to do for someone else later. 可知，当你获得别人的帮助时，很有可能将这样的善举传递给其他人，故选B项。D项干扰性较强，pay it back to the giver与原文意思不符。

　　The behaviour of a building’s users may be at least as important as its design when it comes to energy use, according to new research from the UK Energy Research Centre (UKERC). The UK promises to reduce its carbon emissions(排放) by 80 percent by 2050, part of which will be achieved by all new homes being zero-carbon by 2016. But this report shows that sustainable building design on its own — though extremely important — is not enough to achieve such reductions: the behaviour of the people using the building has to change too.

　　The study suggests that the ways that people use and live in their homes have been largely ignored by existing efforts to improve energy efficiency(效率), which instead focus on architectural and technological developments.

　　‘Technology is going to assist but it is not going to do everything’, explains Katy Janda, a UKERC senior researcher，‘consumption patterns of building users can defeat the most careful design. In other words, old habits die hard, even in the best-designed eco-home.

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