题目

A report says that the world’s natural gas deposits (储存) ________ early in the next century.    A. will run out           B. will be run out    C. will use up            D. will be cleaned up 答案：A下列化合物①Fe3O4②AlCl3 ③FeCl2④FeCl3 ⑤NaHCO3 ⑥H2SiO3，其中不能通过化合反应制取的有           (    )A．1种B．2种C．3种D．4种