11. (2018滨州)—What do you think of the environment here?
—Wonderful! ________ of the land ________ covered with trees and grass.
A. Two fifths; is  B. Two fifth; is
C. Two fifths; are  D. Two fifth; are   
11. A【解析】考查分数和主谓一致的用法。句意“你认为这儿的环境怎么样？”“好极了！的土地被树和草覆盖。”“五分之二”的正确表达应该为two fifths，符合分子超过1时分母的序数词后面要加­s的原则；因为句中land是不可数名词，所以空格处的谓语动词形式用单数形式is，故选A。