题目

实验室中需要配制2 mol·L－1NaOH溶液950mL，配制时应选的容量瓶的规格和称取NaOH的质量分别是() A . 950 mL 76.0g B . 500 mL 80.0 g C . 1000mL 80.0g D . 1000m L 76.0g 答案：C  Was it not until you began to work ______ how much time you had wasted? A. did you realize                                      B. that you realized       C. did you not realize                                D. that you didn’t realize