18．______ of the land in our city_____ covered with trees and grass．（　　）
A．Two fifth，isB．Two fifth，areC．Two fifths，isD．Two fifths，are

分析 我們城市五分之二的土地被樹和草覆蓋著．

解答 答案：C．在英語中，分數(shù)的表達方法是：基數(shù)詞（分子）+序數(shù)詞（分母），分子超過一分母加s； 另外，在含有分數(shù)的主語如是可數(shù)名詞復(fù)數(shù)，謂語動詞用復(fù)數(shù)；如是不可數(shù)名詞，謂語動詞用單數(shù)．又根據(jù)題干中的land是一個整體，是單數(shù)可知，應(yīng)用is．故答案選C．

點評 本題考查分數(shù)的用法，考生在掌握基礎(chǔ)知識的基礎(chǔ)上結(jié)合語境可正確作答．應(yīng)特別注意謂語動詞的用法．

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