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问题 选择题

下列事件是必然事件的是（　　）

A．随意掷两个均匀的骰子，朝上面的点数之和为6

B．抛一枚硬币，正面朝上

C．3个人分成两组，一定有2个人分在一组

D．打开电视，正在播放动画片

答案

A、随意掷两个均匀的骰子，朝上面的点数之和为6，是随机事件，不符合题意；

B、抛一枚硬币，正面朝上，是随机事件，不符合题意；

C、3个人分成两组，一定有2个人分在一组，是必然事件，符合题意；

D、打开电视，正在播放动画片，是随机事件，不符合题意．

故选C．

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选择题

2011年3月26日，一场以遏制全球气候变暖为主题的“地球一小时”关灯接力在全球共134个国家和地区以熄灯接力传递着为保护地球而开展的环保改变。北京、上海、杭州等城市参加这场全球关灯接力，仅北京一座城市，一小时内节电7万千瓦。据此回答1—2题：

1．134个国家和地区一起参加“地球一小时”活动突出体现了可持续发展的 [ ]

A．持续性原则

B．公平性原则

C．共同性原则

D．经济学原则

2．“地球一小时”活动开展的主要目的是

①节约资源保护环境②唤起人们的环保意识

③为人们寻找新的休闲方式④促进全球变暖问题的解决 [ ]

A．①②③

B．①③④

C．②③④

D．①②④

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