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  3. What does the passage mainly discuss? Which of the following conclusions about the Grand Canyon can be drawn from the passage?

What does the passage mainly discuss? Which of the following conclusions about the Grand Canyon can be drawn from the passage?

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问题 What does the passage mainly discuss?
Which of the following conclusions about the Grand Canyon can be drawn from the passage?
选项 A、Its contours 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.
答案A
解析
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大学英语四级

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