单项选择题

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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单项选择题
According to this passage, which is not used for determining the load of a steel beam
A．Microscopic measuring devices.
B．Machines that create large amounts of stress.
C．Machines that can measure force.
D．Analysis of the weight of the beam.
单项选择题
According to the passage, the first phenomenon to contribute to 'the formation of the Grand Canyon was ______.
A．a series of volcanic eruptions
B．the collapse of rock formations in the Colorado Plateau
C．a succession of floods from the Hualapai River and what is now the Colorado River
D．the earth's internal pressure lifting the Colorado Plateau region
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