题目内容
阅读理解
Earth Hour started in Sydney on March 31st, 2007．It calls on families and buildings to turn off the lights from 20∶30 to 21∶30 on the last Saturday night of March． 1 A year later, on March 29, Earth Hour 2008 became a global activity and was supported by 50 million people from thirty-five countries．On March 28, 2010 over 2100 cities in another eight countries took part in it． 2 ．
In 2012 in China, there were many cities taking part in this activity, especially some large cities, such as Beijing, Shanghai…Many citizens consciously(有意识的)turned off lights in the hour． 3 In colleges some students held some activities to make all the students leave their dormitories．
It was 20：30, Beijing time． 4 In Shanghai some people were taking a walk with their families or friends．And in Ningbo some young people were holding a party in a park, singing and dancing． 5 ．
Earth Hour has a variety of activities, but the final goal is the same, that is focusing on(聚焦)climate change and protecting the environment for individuals．
请根据以上内容，从下列五个选项中选择适当的句子还原到短文中，使短文完整与正确。
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