题目

按下表设计进行实验，分组后，在相同的适宜条件下培养8～10小时，并对实验结果进行分析。 实验材料取样处理分组培养液供氧情况 适宜浓度 酵母菌液50 mL破碎细胞(细胞不完整)甲25 mL75 mL无氧 乙25 mL75 mL通氧 50 mL未处理丙25 mL75 mL无氧 丁25 mL75mL通氧 下列叙述正确的是( ) A．甲组不产生CO2而乙组产生   B．甲组的酒精产量与丙组相同 C．丁组能量转换率与丙组相同    D．丁组的氧气消耗量大于乙组What worried the child most was ______ to visit his brother n hospital. [     ]A. his not being allowedB. his not allowing C. his being not allowedD. having not been allowed