单项选择题

The word "wound"(Line 2, Para. 1)indicates that

A．it was caused by some ancient convulsion
B．its presence is an embarrassment to the state of Colorado
C．it looks like an injury on the Earth's surface
D．it has caused many visitors to injure themselves

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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.

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