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俗话说“男女有别”．男性最主要的生殖器官是睾丸，女性最主要的生殖器官是______，它们的作用是产生生殖细胞，并分泌______．进入青春期以后，男同学出现了______ 现象，女同学出现了______现象，说明他们分别能产生精子和卵细胞了．
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