有下列物质：①碘酒溶液 ②高锰酸钾  ③金属汞  ④空气  ⑤氯化钠  ⑥蒸馏水  ⑦铜粉  ⑧氧化铝．请用序号填空：（少选不得分）属于氧化物的有______；属于混合物的有______；属于化合物的有______；由原子直接构成的单质有______．

Some of the books appear to be _______ ones that you have read, but after taking _______ second look, you will find that they are different.

A．/; a

B．the; the

C．the; /

D．the; a