北京市海淀区九年级第二学期期中练习(8)

Earth Hour began in Sydney, Australia, in 2007. In 2008, the event turned into an international one, which has drawn the participation of hundreds of towns and cities worldwide. Now in its fourth year, more and more cities from the world took part in Earth Hour as a show of support for action against global warming.

In a WWF survey suggested after Earth Hour 2009, 80 million U.S. citizens said they had participated, according to Ann. "Earth Hour has always been an event about families and individuals as well," Ann said, "and it's really about Americans and people all over the world standing up and saying climate change is real and we need to do something about it now."

However, Earth Hour's energy-saving influence is limited. But WWF says that Earth Hour's real value is symbolic（象征的）.

65. Did people all over the world turn off the lights on March 27?

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66. What time did the best-known buildings go dark?

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