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【单选题】
目前，我国对于牛奶的安全性管理和相关研究大多集中在食品的微生物指标、重金属指标、农药及抗生素残留指标等方面，对于有关牛奶中激素安全性研究甚少。而2010年7月因武汉3名女婴性早熟病例引发的奶粉“激素们”事件则把牛奶中的雌激素的安全问题提了出来，引起了公众和有关部门的高度重视，这说明（） ①实践是认识发展动力 ②认识具有无限性，人们追求真理是永无止境的过程 ③人的认识能力是有限的 ④获得正确的认识，意味着认识过程的结束
A.
①④
B.
③④
C.
②③
D.
①②
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