题型分类：推论题

原文定位：climate change，Paleolithic；根据关键词可以定位到：“When the ice sheets grew, the sea level would drop as water became locked up in the glaciers; when the ice melted, the sea level would rise again. Falls in sea level often exposed a number of important land bridges, such as those linking Alaska to northeast Asia and Britain to northwest Europe, a phenomenon with far-reaching effects not only on human colonization of the globe but also on the environment as a whole—the flora and fauna of isolated or insular areas were radically and often irreversibly affected”大意为：冰增长时，海平面就会下降，冰融化，海平面就会上升。下降时，会产生陆地桥，影响人类的殖民，同时也影响很多动植物。

选项分析：

C选项：因为寒冷的天气所以陆地桥暴露出来。根据定位句，是因为结冰所以才有陆地桥，结冰可以推理出天气寒冷，所以该选项正确。

A选项：和原文“when the ice melted, the sea level would rise again.”矛盾，海平面上升陆地就少了。

B选项：根据推理，气温高海平面上升，动植物被淹没，所以该选项错误。

D选项：和原文“when the ice melted, the sea level would rise again”相悖。