题目

-Jeff，what does the notice（布告；通知）mean? -It says________． A．bikes can be lent here B．bikes can be fixed up here C．new bikes are sold at a low price here D．do you want a bike? 答案：B分别用足量CO还原10.37gX和9.66gY(X、Y均为铁的氧化物)，结果都得到7.51g单质铁，则X和Y分别为 [　　] A． B． C． D．