18. Deng Xiaoping was our general designer of reform and opening up to the outside world(改革开放). After he passed away, his ____were scattered over the sea.

A．ashes

B．ash

C．dusts

D．Dust

点、线、面的安排是构图的基础思路，点连续延伸的轨迹成为线，（）而成为面。

A、排列

B、累积成堆

C、组合

D、密集成片