第28题: [单项选择]They had talked only for a few minute ______ they found they were of different opinions. A. unless B. while C. before D. once 参考答案:C 答案解析:[解析] 本题考查连词.unless意为“除非”,引导条件状语从句;while引导时间状语从句,主句常用进行时:before引导时间状语从句,意为“在……前”;once引导时间状语从句,意为“一旦”,
第35题: [单项选择]某肺结核患者大咯血致血压突然下降,首选治疗是() A. 输血、补液 B. 垂体后叶素5~10单位+25%葡萄糖40ml,缓慢静脉注射 C. 立即血压监测 D. 氨甲苯酸200mg+25%葡萄糖20ml,静脉注射 E. 间羟胺10mg+多巴胺20mg+0.85%生理盐水1500ml静滴 参考答案:B