What does the passage mainly discuss? What was the geographic position of the upwarp approximately 65 million years ago?

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问题 What does the passage mainly discuss?
What was the geographic position of the upwarp approximately 65 million years ago?

选项 A、To the east of what is now the Colorado River.
B、To the west of the Hualapai River.
C、At the source of the Hualapai River and what is now the Colorado River.
D、Between the Hualapai River and what is now the Colorado River.

答案D

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