单项选择题
A.抗肿瘤金属配合物B.抗代谢药物C.抗肿瘤抗生素D.抗肿瘤植物有效成分E.抗雌激素类药,用于治疗乳腺癌等
A.norms are developedB.norms are enforcedC.people are educated and trainedD.people are rewarded and punished