题目

 ---The computer is becoming smaller and smaller. It runs faster and faster. ---I agree. It has really changed the whole world since it        in 1976.       A. is invented      B. was invented     C. has invented    D. invented     答案：B    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MnO2A.全部   B.①②⑤C.②    D.②③