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How Green Is My (Rooftop) Garden? (1/2) ( 本次听写约182词 )[下载今日慢速VOA听力资料mp3版] (右键另存为)
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Green roofs are designed to save energy and capture rain waterrainwater. Rooftops cover covered with plants hope help keep building buildings cool. They can exstand extend the live life of the a roof. And they can reduce water run off runoff(流失) into streets and store more storm water systems.
Several years ago, the Mayer mayor of Chicagoin Illinoi, visit Illinois, visited Germanyfor lead , a leader in green roof design. Mayer Richadaily late designed Mayor Richard Daley later decided to have education plant in Chicago vegetation（植物） planted on Chicago's City HouseHall. Day Today, the tops of many other bulidings buildings also look like parks.
In Canada, the cause lots of hotel Coast Plaza Hotel in than cooler Vancouver（温哥华） has a forest on its roof. Experts say green roofs usually do not get much above 27 degree celsiursdegrees Celsius. So temparatures temperatures might not be a problem for growninggrowing. But rooftop dwellers gardeners have to be careful not to put too much weight on the roof. It This is true what the whether plants are grown in soil or warterwater.
New York City has an unusual demenstration demonstration farm for high dweller * hydroponics（水栽培）. The farm is on * a boat called the science muchScience Barge（舢板）. Rain warter Rainwater and purified river water are used to use grow lettuce, tomatoes, cucumbers and * the peppers（胡椒）. The farm shows the possibilities for designing rooftop systems.
| 听写于：2008-10-24 11:08 | 用时：32:31 | |
| 正确率：73% (+11.5分) | 错词：49个 |
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