2010 年11月29至12月10日，在墨西哥旅游胜地坎昆举行了联合国气候变化会议。会议期间，“中国日”活动以“低碳发展，中国在行动”为主题，介绍了中国的“低碳发展”，中国承诺将继续采取综合的政策，早日完成减排任务。上述材料中提到的“减排”主要是指减少排放（　　）

对任意的实数x，有$x^3=a_0+a_1\left(x-2\right)+a_2{\left(x-2\right)}^2+a_3{\left(x-2\right)}^3$，则$a_2$的值是（  ）

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    Yesterday was Saturday. It was sunny. I got up at 7:30. After breakfast, I went to the beach with Alice. There were many people on the beach. We ran, jumped and played volleyball on the sands. We swam in the sea. Some men fished on a boat. We had a good time. We were tired, but happy.

单词表：beach 海滩 sands 沙滩 tired 疲乏的 volleyball排球

苏伊士运河沟通了（　　）