题目

    The story happened in ancient times. A king was so clever that he thought of a good way to test 80． his men were reliable. One day, he had a huge rock 81． (place) on a roadway at night. Then he hid 82． (him) nearby and watched carefully to see if anyone would remove the big rock. Some 83． (wealth) businessmen and high officials came by, but they simply walked around it. Many of them even loudly blamed the king for not keeping the roads clear, but none of them would bother 84． (get) the big stone out of the way. Then a villager came along carrying a load of vegetables. O下图是小华配制100g溶质质量分数为5%的NaCl溶液的实验操作示意图： （1）上图中的玻璃仪器分别是广口瓶、量筒、          和玻璃棒，其中玻璃棒在此操作中的作用是                                      。 （2）指出图②中的一处错误操作                                 。 （3）通过计算确定需要水的质量是           g，配制时应选择       （填10、50或100）mL的量筒量取所需要的水。 （4）用上述图示的序号表示配制溶液的操作顺序                          。