Above one third of the population in Beijing and Shanghai netizens, but in poor
areas, only three or four percent online.
A. is, is
B. are, are
C. is, are
D. are, is
网友回答
A. is, is
(答案→)B. are, are
C. is, are
D. are, is
解析：考察主谓一致。Population是集合名词，所以后面的谓语要采用复数形式，