It is understood that in a favorable climate . Studying dead tree rings show .

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问题 It is understood that in a favorable climate ______ .
Studying dead tree rings show ______ .

选项 A、what the people had to eat
B、where the people had to go
C、how the people left
D、why people had to leave

答案D

解析本题为推理题。从文章第3段推断出答案。

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大学英语三级B级

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