（共5小题；每小题2分，满分10分）
根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
71   It was held on the last Saturday of March, which asks households and businesses to turn off their non-essential lights and electrical appliances for one hour to raise awareness towards the need to take action on climate change. Based on an idea successfully executed(执行) in Thailand in 2005, it was pioneered by WWF Australia and the Sydney Morning Herald in 2007, and achieved worldwide participation in 2008.  72  
Earth Hour 2007
Earth Hour was held in Sydney, Australia at 7:30 pm, local time.
Earth Hour 2008
The official website for the event, earthhour.org, received over 6.7 million unique visitors in the week leading up to Earth Hour.73     
According to a Zogby International online survey 36 million people participated in Earth Hour 2008. The survey also showed there was a 4 percentage point increase in awareness of environmental issues such as climate change, directly after the event. (However a search of Zogby's website and archive fails to produce any such survey or reference to the event)
74   
Earth Hour 2009 is from 8:30 p.m. to 9:30 p.m. local time, March 28 2009. Currently, 82 countries and more than 2100 cities are committed to Earth Hour 2009, a huge increase from people participating in 35 countries for Earth Hour 2008.
75   

A．Earth Hour 2009

B．Other websites took part in the event, with Google's homepage going :"dark" on the day.

C．Earth Hour is an annual international event created by the WWF .

D．The aim of Earth Hour is to call on the public to save energy.

E. People are invent to provide blogs and short video clips on how they spend their time.
F．The time for Earth Hour is the same all the time．
G．Earth Hour will next take place on Saturday，March 28，2009 at 8：30 pm，local time．