The population one third of which farmer workers increasing very fast.A. is; areB. is; i

问题补充：

The population, one third of which farmer workers, increasing very fast.

A. is; are

B. is; is

C. are; is

D. are; are

答案：

A. is; are

B. is; is

(答案→)C. are; is

D. are; are

解析：考查主谓一致。Population单独做主语位于动词用单数；当population前面有分数百分数的时候，位于动词用复数。故选C。