题目

下列仪器中，不能用做反应容器的是：①试管 ②胶头滴管 ③集气瓶 ④量筒 ⑤ 烧杯(  )A．①②③   B．④⑤⑥  C．②③④ D.  ②④    答案：C_____ was known to all, John had broken his promise _____ he would stay with us for some time. [     ]A. As; that B. As; which C. It; that D. Which; that