B．a major cause of climate change

　　C．some former theory

　　D．the expectation of other scientists

　　答案　A　[细节理解题。从第二段以及第六段可知A项正确。]

　　B

　　More than 134 countries across the world, including the UK, switched off their lights for an hour on Sunday to support action to create a sustainable(可持续的) future for the planet.

　　Environmental charity World Wildlife Fund has organised the Earth Hour event which saw iconic buildings such as Big Ben, the BT Tower, Buckingham Palace, Windsor Castle, Edinburgh Castle, Clifton Suspension Bridge in Bristol, Stormont in Northern Ireland and Cardiff's Millennium Centre blacking_out for an hour.

　　The event, which took place at 8：30pm Sunday around the world, started in Fiji, New Zealand and Australia. The aim is to highlight(突出) the charity's call on governments, organisations and individuals to pledge(保证) their commitment to tackling climate change.

　　At the Royal Albert Hall in London, television presenter Kirsty Gallacher led a team of 60 cyclists from the UK­World Wildlife Fund to create a huge human­powered projection(投影) with images of endangered species including dolphins and tigers being shone on to the building.Colin Butfield, head of campaigns, WWF­UK, said: “Our event at the Royal Albert Hall, alongside the hundreds of thousands of events across the world, shows global support for the need to tackle climate change and protect the natural world. ”

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