14．About ______ of the land ______ covered with trees and grass．（　　）
A．three fifths； isB．three fifths； are
C．three fifth； are   

分析 五分之三的陸地被樹木和草所覆蓋．

解答 答案：A．
根據(jù)選項可知，第一個空所缺為分數(shù)；又知分數(shù)的表達法為分子基數(shù)詞，分母序數(shù)詞，分子大于一，分母加s，所以五分之三的表達方法為three fifths．又根據(jù)分數(shù)作主語時，其后的謂語動詞的單復數(shù)取決于它所修飾的名詞，即此處的land．又知land意為陸地，土地，為不可數(shù)名詞，所以第二個空缺處應用is．故選A．

點評 此題考查分數(shù)的用法．做題時，要根據(jù)分數(shù)的用法篩選出答案．

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