全球许多地标性建筑响应“地球一小时”的号召,在每年3月最后一个星期六熄灯一小时。(respond to) 2. 数以百万计的人参加了“地球一小时”,以行动承诺他们对地球的支持。(take part in) 3.我们发起了一场创建绿色家园的活动。(launch a campaign) 4.我们应当勇敢地承担起对地球的责任。(responsibility) 5. 地球日让人们更关注环境问题。(draw attention to)
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