赞题库-背景图

单项选择题

According to the passage how many miles long was the trench that became known as the Grand Canyon

A．10 100.
B．277.
C．14.
D．10.

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热门试题

单项选择题It can be concluded from this passage about the Grand Canyon that ______.

A．its shapes are constantly changing
B．it contains approximately 14 million tons of rock
C．its eruptions have increased in recent years
D．it is being eroded by toxic waste and pollutants

单项选择题The passage mainly discusses______.

A．patterns of erosion in different mountain ranges
B．forces that made the Grand Canyon
C．the increasing pollution of the Colorado River
D．the sudden appearance of the Grand Canyon