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【单选题】
多年来人们对“太空中能看到长城”这一说法一直深信不疑。但是，我国太空第一人在顺利返回地面后却不假思索地回答：“没有。”这一回答说明（） ①只有亲眼看到才是真实的 ②感性认识必须上升到理性认识 ③实践是检验认识正确与否的唯一标准 ④必须坚持实事求是的科学态度A.
①②③④
B.
②③④
C.
②④
D.
③④
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