第7题: [单项选择]同层动态增强扫描主要研究病灶的增强特征,鉴别其性质,最常用于() A. 肝癌与血管瘤的定性 B. 提高小肝癌的检出率 C. 判断肝门淋巴结有无转移 D. 肝癌与肝脓肿的鉴别 E. 提高肝腺瘤的检出率 参考答案:A 答案解析:肝脏正常供血大约25%由肝动脉供血,75%,由门静脉供血,肝癌本身是以动脉供血为主,故动脉期增强明显,俗称"快进快出",肝血管瘤是以门静脉供血为主,故静脉期增强明显,俗称"快进慢出"。
第12题: [单项选择]Which group of people make some efforts to help pupils in elementary schools A. Teachers B. Researchers C. Grandparents D. Senior citizens 参考答案:D 答案解析:文章的倒数第五行有这么一句:“Thus,the small efforts of the man--the seniors--complement the large efforts of the f