题目

Last month, he wrote me ___letter. ( )A. a 1000-word B. 1000 words C. a 1000-words D. 1000 words 答案：【答案】A【解析】略 Nearly ________ of the surface of the earth ________ covered by water． [　　] A．three quarter…is B．three quarters…is C．three quarter…are D．three quarters…are