One third of our school covered by trees, while the majority of our students girls. A. i

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A. is, is
B. are; are
(答案→)C. is; are
D. are; is
解析：考查主谓一致：句意：我们学校三分之一都被树覆盖了，而学生中大部分是女生。主语被分数修饰，谓语和分数修饰的名词决定，这句话one third of后面是our school，所以第一空填is，the majority of修饰名词做主语，谓语也是和名词决定，这里是和our students一致，谓语用复数，选C。