题目

Once upon a time, a blind man was sitting at the roadside with a hat by his feet. There was a sign beside him, 56. _______ (say), “I am blind. Please help me.” 57. __________ good many passers-by walked by him, but few of them helped him. A creative young man named Tom was going to his office. While walking by the blind man, he stopped 58.______________(see) that the man only had a few coins in his hat. He bent down and put a few of his own coins in the hat. Without asking for the blind man’s 59. _____________(permit), he took the sign, turned it around and wrote a new message. 以下实验原理或操作中，正确的是（　　） A、装置①量取15.00 mLNaOH溶液B、装置②既可用于乙醇制乙烯的发生装置，又可用于分离沸点相差较大的互溶液体混合物C、室温下，含有CoCl2的干燥变色硅胶呈蓝色，在潮湿的空气中变粉红色，放在干燥的空气中又恢复为蓝色D、纸层析法分离铁离子和铜离子实验中，展开剂的成份为蒸馏水与丙酮