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
A．its own set of ideas, beliefs and ways of lifeB．an extremely complex and delicate languageC．its own elegant music, literature, and other artsD．the process of growing crops or raising animals