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我国西北地区发展农业生产最主要的限制性因素是（） A．土地资源不足 B．化肥农药不足 C．劳动力不足 D．水资源不足

A.土地资源不足
B.化肥农药不足
C.劳动力不足
D.水资源不足

【参考答案】

D
本题考查的是对西北地区农业发展的了解，西北地区由于降水少，水资源不足，是制约农业发展的主要限制性因素。故D项正确。

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