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【单选题】
原来被称作“北大荒”的东北平原，现早已成为全国著名的“北大仓”。下列关于东北平原和华北平原的比较，正确的是 [     ]
A.
制约东北平原和华北平原农业发展的主要因素分别是水资源不足和夏季热量不足
B.
农作物熟制东北平原两年三熟，华北平原一年一熟或一年两熟
C.
糖料作物东北平原以甜菜为主，华北平原以甘蔗为主
D.
粮食作物东北平原以春小麦为主，华北平原以冬小麦为主
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