【单选题】【消耗次数：1】
下列骨肉瘤的表现中，错误的是
①
恶性骨肿瘤中最常见的一种
②
多数在11～30岁发病
③
绝大多数为单发，好发于四肢长骨
④
疼痛、肿胀和跛行、运动障碍是本病主要症状
⑤
早期碱性磷酸酶增高，复发和转移时，则碱性磷酸酶下降
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