【题目】The population in Japan ________ not very large. But it is reported that about twenty-five percent of the population ________ old people.
A. is; is B. are; are C. is; are D. are; is
在线课程【答案】C
【解析】
考查主谓一致。句意：日本的人口不是很大。但据报道，大约有25%的人口是老年人。Population做主语后面的谓语动词用单数形式；如果是Population的一部分做主语，则谓语动词用复数形式，故选C。