第15题: [单项选择]与特发性血小板减少性紫癜血小板减少无关的是（） A. 营养不良使血小板生成减少 B. 病理性免疫产生血小板抗体 C. 脾产生血小板特异性IgG D. 血小板在脾脏遭到破坏 E. 免疫抗体影响巨核细胞成熟 参考答案:A 答案解析:ITP引起血小板减少的因素主要是免疫因素、肝脾因素，与营养不良无关。
第18题:[不定项选择题]On Venus there is a lot of__________. A.water B.carbon dioxide C.carbon monoxide D.oxygen 参考答案:B 由第二段的最后一句话中的“there is only a tiny amount of water there(Venus)”得知，A选项错误。第三段结尾说明，藻类通过火箭运往金星，然后“In a fairly short time，the algae will break down thecarbon dioxide into oxygen and carbon”，说明金星上有大量的二氧化碳。C和D选项错误。故选B。
第24题: [单项选择]A. She forgot to write down the message. B. She had to try several times to get her call through. C. She didn’t understand the caller’s message. D. She didn’t get to the phone in time. 参考答案:C 答案解析:[解析] M: Are there any messages for me W: Someone did call you. But there was so much static,
