题目

为验证淀粉水解可生成还原性糖，进行了下列实验，该实验中操作步骤的排列顺序正确的是      ①取少量淀粉加水制成溶液; ②加热煮沸; ③加入新制的Cu(OH)2悬浊液; ④加入几滴稀H2SO4;⑤再加热; ⑥加入碱液，中和并呈碱性     A．①④⑤⑥③②  B．⑤④②③①⑥   C．①④②⑥③⑤  D．①⑤③④⑥②     Eric received training in computer for one year, _____ he found a job in a big company. A. after that        B. after which          C. after it         D. after this