第二节 简答题（共5小题, 每小题2分, 满分10分）
阅读下面短文, 根据第71至第75小题的具体要求, 简要回答问题, 并将答案转写到答题卡上.
Lights went out at tourism landmarks（地标）and homes across the globe on Saturday for Earth Hour 2009, a global event aimed to highlight the threat from climate change.
From the Sydney Opera House and Harbour Bridge to the Eiffel Tower in Paris and London's Houses of Parliament, lights were turned off as part of a campaign to encourage people to cut energy use and control greenhouse gas emissions from fuels.
