2. 外语
  3. Earth Hour is an annual global campaign that encourages people and businesses around the world to switch off【B1】______ at the sa

Earth Hour is an annual global campaign that encourages people and businesses around the world to switch off【B1】______ at the sa

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问题     Earth Hour is an annual global campaign that encourages people and businesses around the world to switch off【B1】______ at the same time for one hour. It started in Australia in 2007 when 2.2 million people in the city of Sydney turned off all non-essential lights for an hour. Since then it has grown to a【B2】______ global event. Every year well-known buildings around the world【B3】______ and "go dark" for Earth Hour.
    Earth Hour is organised by the World Wide Fund for Nature(WWF). It was started by Andy Ridley,【B4】______ from Britain, who is executive director of Earth Hour Global, WWF. He【B5】______ the idea of Earth Hour because he wanted to 【B6】______ awareness of environmental issues by asking people to do something positive to help the planet. Switching off the lights for an hour can make a small difference to the 【B7】______ of energy we use, but Earth Hour is also a【B8】______ event to make people think about the problems of climate change.
    Earth Hour is held worldwide annually from 8:30 to 9:30 p.m. on the last Saturday in March. Reason for this is that the end of March is around the time of the spring and autumn equinoxes(春分；秋分 )in the northern and southern hemispheres(半球)【B9】______, so sunset times in both hemispheres are at similar times. This means that a global "lights out" event has most【B10】______ impact at this time of year.
【B4】
选项
答案originally
解析 此空所在句不缺句子的主要成分，可推测此空需填入副词。originally“起初”。
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大学英语四级

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