【单选题】【消耗次数：1】
地球以地表为界分为外圈和内圈，以下各项不属于外圈的是（）。
①
大气圈
②
水圈
③
生物圈
④
地核
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相关题目
【单选题】
通常把地球表层系统中的大气圈、生物圈、岩石圈、水圈和土壤圈作为构成自然地理环境的五大要素。其中（）是它们连接的纽带，构成了结合无机界和有机界—即生命和非生命联系的中心环境。
①
A大气圈
②
B生物圈
③
C岩石圈
④
D土壤圈
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could
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why; that
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