题目

 Although the film star has got a tight schedule these days, our boss is still _________ to have him invited to the party for the promotion of our new product.    A. concerned        B. determined      C. frustrated        D. annoyed 答案：B在传统发酵技术中，果醋的制作往往在果酒制作基础上进行，下图中图甲是果酒果醋发酵装置，乙是发酵过程中培养液pH变化曲线图，下列叙述错误的是A.若发酵初期不通入气体，溶液中没有气泡产生B.中期可以闻到酒香，说明进行了酒精发酵C.后期接种醋酸菌，需通气并适当升高温度D.图乙中能正确表示pH变化的曲线是②