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【原题呈现】阅读图文资料,完成下列要求。白令海峡(图1)宽35~86千米,平均水深42米,最大水深52米,海峡两侧为山地。在第四纪冰期全盛时,亚欧大陆与美洲大陆相连,印第安人祖先由此进入美洲。冰后期,温度上升,海平面升高,白令海峡形成,亚欧大陆与美洲大陆间联系受到阻碍。即使在冬季白令海峡封冻时,人们仍难以徒步跨越。
[Original title] read graphic information, to complete the following requirements. The Bering Strait (Figure 1) is 35 to 86 kilometers wide, with an average depth of 42 meters and a maximum water depth of 52 meters. Both sides of the Strait are mountains. During the heyday of the Quaternary ice age, the Eurasian continent was connected to the American continent, and the Indian ancestors thus entered the Americas. After the ice, the temperature rises, sea level rise, the formation of the Bering Strait, Asia-Europe continent and the Americas between the hindered. Even when the winter Bering Strait is frozen, people are still struggling to get around.