______is narrow in the north and wide in the south? ______is drained by one of the world’s greatest river systems?

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问题 ______is narrow in the north and wide in the south?
______is drained by one of the world’s greatest river systems?

选项 A、 
B、 
C、 
D、 

答案B

解析 题目问:"哪一部分被世界上最大的水系之一所排干?"根据原文内容"Almost all of the region is drained by one of the world’s greatest river systems—the Mississippi-Missouri",因此答案为B。
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