Willerslev's professors suggested a Plan B. They could investigate ancient ice that climate researchers at the University of Copenhagen had brought back from Greenland.
所以威勒斯列夫博士的一个老师就提出一个备选方案：他们可以去研究哥本哈根大学的气候研究学者们从格陵兰带回来的远古冰块。
B. The sea ice is melting earlier and forming later. C. The climate is changing due to people's activities. D. People killed too many polar bears.
文章最后一段讲述的是北极熊数量减少的原因，由于人类的活动引起气候变暖，因此使北冰洋的冰的面积减少，从而使北极熊的数量变少。
B: YesJ dare say the giant ice pagodas, Bridges, and lanterns made a good impression on you.
B：是的，我敢说巨大的冰塔、冰桥、冰灯给您留下了很好的印象。
The nomads who made these markings lived by hunting and fishing during the last Ice Age which began about 35,000 B. C. and ended about 10,000 B.
这些痕迹是游牧人留下的，他们生活在从公元前约35，000年到公元前10，000年的冰川期的末期，以狩猎、捕鱼为生。
The nomads who made these markings lived by hunting ad fishing during the last Ice Age which began about 35,00 B. C. and ended about 10,000 B. C.
作出这些刻 记的游牧人，依靠狩猎和捕鱼生活在冰河时代的晚期。这段时期大约始于公元前 35，000 年而结束于公元前 10，000 年。
The nomads who made these markings lived by hunting ad fishing during the last Ice Age which began about 35,00 B. C. and ended about 10,000 B. C.
作出这些刻 记的游牧人，依靠狩猎和捕鱼生活在冰河时代的晚期。这段时期大约始于公元前 35，000 年而结束于公元前 10，000 年。
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