题目

下列各组仪器中可以用酒精灯直接加热的一组是(     ) A．试管、蒸发皿                          B．试管、烧杯    C．坩埚、平底烧瓶                        D．蒸发皿、圆底烧瓶 答案：AWhat he regrets is that more than a chance _____. [     ]A. were given upB. is given up C. has been given up D. have been given up