______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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