第25题: [单项选择]Why do sharks normally swim between ten and twenty miles off the coast of Britain A. They prefer warm water to cold water. B. They see best in deep water. C. They are afraid of man. D. That is where their food is. 参考答案:D 答案解析:由第三段第一句就可以得到答案。
第26题: [单项选择]支气管哮喘可致() A. 阻塞性通气不足 B. 限制性通气不足 C. 弥散障碍 D. 通气血流比例失调 E. 肺泡表面活性物质破坏 参考答案:A