下列哪些良性肿瘤容易恶变() ["A．膀胱乳头状瘤","B．卵巢浆液性乳头状囊腺瘤","C．声带乳头状瘤","D．皮肤乳头状瘤","E．外耳道乳头状瘤"]
下列经化生后可发生鳞状细胞癌的部位有() ["A．食管","B．子宫","C．支气管","D．胆囊","E．肾盂"]
与辐射有关的肿瘤有() ["A．淋巴瘤","B．乳腺癌","C．甲状腺癌","D．白血病","E．皮肤癌"]
癌与肉瘤的转移特点有() ["A．癌只发生淋巴道转移，肉瘤只发生血道转移","B．肉瘤只发生淋巴道转移，癌只发生血道转移","C．两着均发生淋巴道转移和血道转移","D．两着均发生种植性转移","E．癌多经淋巴道转移，肉瘤多经血道转移"]
间接作用的化学致癌物是() ["A．多环芳烃如3，4-苯并芘等","B．芳香胺类如乙萘胺","C．氨基偶氮染料如二甲基氨基偶氮苯","D．亚硝胺类","E．黄曲霉毒素如黄曲霉毒素B1"]
