is narrow in the north and wide in the south? was once covered by a great inland sea?

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问题 ______is narrow in the north and wide in the south?
______was once covered by a great inland sea?

选项 A、
B、
C、
D、

答案B

解析题目问："哪一部分曾经被内海覆盖?"根据原文内容"Once covered by a great inland sea，the Interior Plains are underlain by sedimentary rock"，所以答案选B。

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公共英语五级笔试

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