The population of this city 30% of which 10% in the last two years. A. are Chinese; has

问题补充：

The population of this city, 30% of which, 10% in the last two years.

A. are Chinese; has risen by

B. are China; has fallen by

C. is Chinese ; have increased

D. is China; have reduced by

答案：

(答案→)A. are Chinese; has risen by

B. are China; has fallen by

C. is Chinese ; have increased

D. is China; have reduced by

解析：population人口作主语时谓语动词用第三人称单数，但是当population与分数、百分数连用做主语时谓语动词用复数，因此本题选A。