One third of the country covered with trees and the majority of the citizens black people.

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(答案→)A. is; are
B. is; is
C. are; are
D. are; is
解析：考查主谓一致。分数和百分数做主语，谓语动词与其后面的名词保持一致，名词是不可数名词谓语动词用单数，后面的名词是可数名词复数，谓语动词用复数。The country指国家面积，是不可数名词，故第一空用单数；the citizens是复数形式，故第二空用复数形式。故A正确。