When was ______ that the suggestion was put forward ______ the seven-day Labor Day Golden Week holiday be cancelled? [    ]

A. that; that

B. it; which

C. it; that

D. that; what  

下例物质是按单质、化合物、混合物的顺序排列的是（）。

A.液氨、烧碱、碘酒

B.铁、液氨、氯化氢

C.氮气、胆矾、福尔马林

D.铁、干冰、氯化氢