单选：我国有四大牧区，它们在自然条件方面的共同特征是（）A．湿润、半湿润的平原，水源丰富B．都分布在黄河以北地区C．降水较少，有广阔的天然草场D．

题目分类：地球科学
题目类型：单选
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题目内容：

我国有四大牧区，它们在自然条件方面的共同特征是（）
A．湿润、半湿润的平原，水源丰富
B．都分布在黄河以北地区
C．降水较少，有广阔的天然草场
D．地形陡峭，水土易流失

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