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【多选题】
有一类活化石植物，曾经与恐龙一样，同属“爬行动物”时代的两大标志，这类植物不开花不结实，但亿万年来仍繁盛于地球上，这是哪类植物呢？这类植物如何来繁殖？
A.
孢子繁殖
B.
桫椤科植物
C.
种子繁殖
D.
苏铁科植物
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