---The population of Henan very fast.---I agree. The population problem may be one of the

问题补充：

---The population of Henan very fast.

---I agree. The population problem may be one of the most serious ones today.

A. are growing

B. grew

C. is growing

D. is grown

答案：

A. are growing

B. grew

(答案→)C. is growing

D. is grown

解析：考查情景交际。“河南省的人口增长很快。”“同意。如今人口问题可能会成为最严重的问题之一。”population作主语，谓语用单数，故选C。