第20题: [单项选择]垂体大腺瘤的CT表现中，下列哪项是错误的（） A. 肿瘤呈圆形，或呈分叶或不规则形 B. 垂体瘤钙化较多见 C. 平扫为等密度，或略高密度、低密度 D. 冠状扫描显示肿瘤呈哑铃状 E. 增强扫描，大多数呈均匀强化 参考答案:B 答案解析:垂体大腺瘤钙化很少见，呈分散点状亦可呈块状，多见于放疗后。
A. The reason drama is often unpredictable. B. The seasons in which dramas were performed. C. The connection between myths and dramatic plots. D. The importance of costumes in early drama. 参考答案:C 答案解析:第一段中的第一句话与最后一句话提供出关键信息…but the stories，later called myths，persisted and provided material for art an
