A. the extra heat B. rapid exaggeration of impacts C. the exposed ground D. recorded history E. a very long time F. previously p

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问题 A. the extra heat
B. rapid exaggeration of impacts
C. the exposed ground
D. recorded history
E. a very long time
F. previously published studies
Arctic ice has never been melting so fast in______.

选项

答案D

解析 由第一段第三句“…recorded history.”可知,空格处应填D项。
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