第7题: [单项选择]Passage Two Questions 29 to 32 are based on the passage you have just heard. A. They were expensive. B. No one believes them. C. They were unsuccessful. D. They were often deceptive. 参考答案:D 答案解析:[听力原文] 29-32
Over the past decade, the environmental movement has exploded onto the mind
第21题: [单项选择]与X线体层摄影比较，CT最主要的优点是 A. 设备简单 B. 病人摆位置较简便 C. X线辐射剂量较小 D. 可使用对比剂增强 E. 无层面外组织结构干扰重叠 参考答案:E 答案解析:CT成像克服了组织与器官重叠现象与散射线干扰，又通过图像重建计算，提高了对组织器官密度的分辨能力，这些是 CT最主要的特点。
