A、Extinction of Arctic wildlife.
B、Iceless summers in the Arctic.
C、Emigration of indigenous people.
D、Better understanding of ecosystems.
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A、Extinction of Arctic wildlife.
B、Iceless summers in the Arctic.
C、Emigration of indigenous people.
D、Better understanding of ecosystems.
时间：2021-07-19 13:00 关键词： 综合类 语言 英语六级 2018年12月《大学英语六级》真题（卷一）
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