第3题: [单项选择]Passage Two Questions 29 to 31 are based on the passage you have just heard.A. New varieties of corn have been developed. B. The crops need less fertilizer. C. Farmers can now monitor crop growth. D. Crop yields are much greater. 参考答案:D 答案解析:[解析] 29-31 If you flew over certain parts of Nebraska and Texas by plane, there would be a go
第4题: [单项选择]消化性溃疡最常见的并发症是 A. 幽门梗阻 B. 出血 C. 穿孔 D. 癌变 参考答案:B 答案解析:[考点] 消化性溃疡并发症
[分析] 约15%~25%的消化性溃疡患者可并发出血,约10%~25%的患者以上消化道出血为首发表现。