对于如图所示的细菌产气试验的描述，正确的是（）
A.1不产气，2产气
B.1产气，2不产气
C.两者都不产气
D.两者均产气
E.无法确定
参考答案：B
One person was killed on the spot and three ________ received minor injuries.
A．ones
B．another
C．others
D．the others
矿山压气设备由那几部分组成？
