单项选择题
单项选择题 男，20岁，民工，夏季喜食生冷水，于昨日下午突起剧烈腹泻，呕吐6小时，共吐10余次，腹泻水样便10余次，无发热，无腹痛，无里急后重，先泻后吐，量多，入院时尿量仅200ml/d应立即进行哪项检查
单项选择题 下列选项中,( )一般不能作为ETF的发起人。
单项选择题 听力原文：David is not to be seen in this lab from tomorrow, is he?(A) No, he took a job offer at Wesley.(B) Let's wrap up this meeting here.(C) Yes, he has an appointment tomorrow.(8)A． B． C．