“五步法”攻克英语四\六级听力选择题
experts disagree strongly on just how unstable it is. Now new evidence reveals that all or most of the West Antarctic ice sheet collapsed at least once during the past 1.3 million years, a period when global temperatures probably will not be significantly higher than they are today.
解析：考生可以看到文中变色部分的句子既含有转折信号词，也涉及上文提到的“
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