第6题: [单项选择]关于早期胃癌的定义，正确的是 A. 癌组织局限于黏膜内，无转移 B. 癌组织局限于黏膜内或侵及黏膜下层，无转移 C. 癌组织局限于黏膜内或侵及固有肌层，无转移 D. 癌组织局限于黏膜内，可有转移 E. 癌组织局限于黏膜内或侵及黏膜下层，不论有无转移 参考答案:E 答案解析:早期胃癌指癌局限于黏膜或黏膜下层，而不论其大小或有无转移。
第15题: [单项选择]When he was（ ）he had become a professor. A. in his early thirty B. in his early thirties C. in his thirty early D. in his thirty earlier 参考答案:B 答案解析:
