Dr. Budyko argues that at ice-free Arctic Ocean is the "normal" situation 布地柯博士认为，北冰洋不冻才是“正常”情况。
2.
The Arctic Ocean, which experienced record melting last year, could be ice-free in the summer as soon as 2013, decades ahead of what the earlier models told us. 北极地区去年创纪录的融化速度警告我们，按照现有状况推断，到2013年夏天最后一块冰就会消失。
词汇听力：
小测验：选择正确的单词