While he was investigating ways to improve the telescope, Newton made      discovery which completely

changed          man's understanding of color.[ ]

A. a; /              

B. a; the            

C. /; the          

D. the; a

我国现行税法规定，对法人或其他组织处以( )元以下罚款的违法案件，如果案情简单、事实清楚、违法后果比较简单且有法定依据应当给予处罚，就可以由税务行政执法人员当场作出税务行政处罚。

A．500
B．1 000
C．2 000
D．5 000