is narrow in the north and wide in the south? is characterized by a structural trough?

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问题 ______is narrow in the north and wide in the south?
______is characterized by a structural trough?

选项 A、
B、
C、
D、

答案D

解析题目问："结构槽是哪一部分的特点?"根据文章内容"West of the Cascades and the Sierra Nevada and separated from them by a structural trough are the Coast Ranges"，因此答案为D。

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