One-third of the country covered with trees and the majority of the citizens black peopl

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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：句意：这个国家三分之一都是被树覆盖着，大部分居民是黑人。第一空的主语One-third of the country，当主语是分数的时候，谓语和分数修饰的名词一致，这里是和the country一致，谓语是单数，第二空的主语是the majority of the citizens还是和名词一致，用复数，选A。