According to the survey, two thirds of the area covered by trees now and 90% of the population contributions to the Greening Project in the city.
A. is ; has made
B. are; have made
C. is; have made
D. are; has made
网友回答
A. is ; has made
B. are; have made
(答案→)C. is; have made
D. are; has made
解析：这题考察主谓 一致,当主语是分数和百分数时,谓语和它们修饰的名词一致,因为第一空的主语是 two thirds of the area所以第一空填is, ,第二空主语是90% of the population,强调具体的人,填have made.选C.