题目

在“探究100毫升的水能溶解多少克食盐”的实验中，下列做法不正确的是（ ）。 A . 用量筒测出100毫升水 B . 用勺子随意取食盐 C . 等第一份加进去的食盐完全溶解后，再加第二份 答案：B21、We hurried all the way to the airport, only      that the flight had been called off because of the foggy weather. A．being told          B．to be told         C．having told          D．to have been told