题目

—Did you go to visit the Acropolis yesterday? —I had meant to, but it             all the time        A． is raining             B． was raining          C． has been raining   D． had rained 答案：  B实验室将9 g铝粉跟一定量的金属氧化物粉末混合形成铝热剂。发生铝热反应之后，所得固体中含金属单质18 g，则该氧化物粉末可能是(双选)(　　) A．Fe2O3和MnO2                         B．MnO2和V2O5 C．Cr2O3和V2O5                           D．Fe3O4和FeO