标题: og208 [打印本页] 作者: sunhx 时间: 2003-12-6 10:21 标题: og208 Teratomas are unusual forms of cancer because they are composed of tissues such as tooth and bone not normally found in the organ in which the tumor appears. A because they are composed of tissues such as tooth and bone B because they are composed of tissues like tooth and bone that are c because they are composed of tissues, like tooth and bone, tissues D in that their composition, tissues such as tooth and bone, is E in that they are composed of tissues such as tooth and bone, tissues