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.
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Abecause they are composed of tissues such as tooth and bone
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Bbecause they are composed of tissues like tooth and bone that are
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Cbecause they are composed of tissues, like tooth and bone, tissues
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Din that their composition, tissues such as tooth and bone, is
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Ein that they are composed of tissues such as tooth and bone, tissues
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正确答案: E