题目内容
（请给出正确答案）
[主观题]
What was the geographic position of the upwarp approximately 65 million years ago？A．To the
What was the geographic position of the upwarp approximately 65 million years ago？
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.
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