题目

下列条件一定能使反应速率加快的是     ①增加反应物的物质的量 ②升高温度  ③缩小反应容器的体积     ④加入生成物            ⑤加入MnO2 A．全部            B．①②⑤             C．②             D．②③ 答案：CNews came from the company _____ my brother was fired due to his bad performance. [     ]A. which B. where C. what D. that