2. 外语
  3. ______is narrow in the north and wide in the south? ______was formed by volcanic lava?

______is narrow in the north and wide in the south? ______was formed by volcanic lava?

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问题 ______is narrow in the north and wide in the south?
______was formed by volcanic lava?
选项 A、 
B、 
C、 
D、 
答案C
解析 题目问："哪一部分由火山灰构成?"根据原文内容"The Columbia Plateau，in the north of the region，was formed by volcanic lava and is drained by the Columbia River and its tributary the Snake River，both of which have cut deep canyons into the Plateau"可以得出答案C。
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