About one third of the population in Beijing and Shanghai netizens, but in poorest areas, only three or four percent online.
A. is; is
B. are; are
C. are; is
D. is; are
网友回答
A. is; is
(答案→)B. are; are
C. are; is
D. is; are
解析：句意：北京和上海人口的1/3都是网民而在最贫穷的地区仅仅3%或4%的人在线。这里population的意思是：人。相当于people,是集合名词，此时做主语谓语动词用复数，第二空只是在only three or four percent之后省略了of the population，所以这两个空都用复数，故选B。