第3题: [简答题]Growing numbers of scientists therefore see Antarctica as a distant early warning sensor, where potentially dangerous global trends may be spotted before they show up to the north.
_______________________________________________________________________________ 参考答案:因此,越来越多的科学家把南极洲视为一个远距离早期报警敏感器,在那里地球许多潜在的危险动向早在它们出现于北方以前就能被发现。