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当前学科:高中政治思想品德
题目:
单选题
谷子是起源于我国的古老作物,脱壳后为小米。但长期以来,科研人员对谷子遗传资源的群体结构缺乏了解,限制了对谷子基因资源的高效发掘和深度利用。近期,我国科学家率先绘出谷子基因组重要图谱,这对未来禾谷类作物的品种改良、能源作物的遗传解析产生深远的影响。材料揭示了() ①世界上只有尚未认识之物,没有不可认识之物 ②真理都有自己适用的条件和范围 ③认识是主体对客体的直接现实性改造 ④认识水平制约实践活动的效果
A
①②
B
①④
C
②③
D
③④
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