题目

—Oh, my God! I just missed the last bus back home. —That’s really bad. I’m sure you                      it, but you were not in a hurry. A．could catch                B．had caught           C．could have caught           D．would catch 答案：C取用药品时，没有说明用量，液体取________；托盘天平能称准到________；向酒精灯添加酒精，不能超过酒精灯容积的________；给试管里液体加热．液体体积不要超过试管容积的________；同时试管倾斜约________．