In the time of social reform, people's state of mind tends to  ________with the rapid changes

of society.[    ]

A. keep pace            

B. keep touch

C. go on        

D. make progress

为减轻弧光的有害范围，应采用（）的材料作室内墙壁的饰品。

A.反光

B.发光

C.不反光

D.透明