新西兰的奶业生产具有显著的季节性特征，这一特征是牧草的生长季

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新西兰的奶业生产具有显著的季节性特征，这一特征是牧草的生长季节所决定的．新西兰的奶牛每年有60～70天的干奶期，称为“奶牛假期（cow’s holiday）”．读有机牧草季节性生长曲线与产奶量的关系图（下图），回答下列各题．

“奶牛假期”出现时，下列现象正确的是

A．罗马炎热干燥	B．地球公转速度越来越慢
C．北京昼短夜长	D．夏威夷高压势力减弱

影响新西兰奶牛产奶量和草场生长状况的共同因素是

A．气温	B．降水量
C．市场	D．土壤

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