51. Nearly ______ of the earth ______ covered by sea.

　　A.three fourth; is B.three fourths; is

　　C.three fourth; are D.three fourths; are

　　52. ______ of the land in that district ______ covered with trees and grass.

　　A.Two fifths; is B.Two fifth; are

　　C.Two fifth; is D.Two fifths; are

　　53. It took us quite a long time to get here. It was ______ journey.

　　A.three-hour B.a three hour

　　C.a three-hour D.three hours

　　54. Two ______ died of cold last winter

　　A.hundreds old people B.hundred old people

　　C.hundreds old peoples D.hundred old peoples

　　55. After the new technique was introduced, the factory produced tractors in1988 ______ as the year before.

　　A.as twice many B.as many twice

　　C.twice as many D.twice many as

　　答案

　　51.【答案】B。解析：考查分数表达。句意：几乎地球表面的四分之三被海洋覆盖。分数的表达方式：分子用基数词，分母用序数词，当分子超过一了，分母变复数，本题中把地球看做整体，所以谓语动词用单数，故选B。

　　52.【答案】A。解析：考查分数的表达法，分子基数词，分母序数词，分子超过一，分母加s。分数做主语，此处代表不可数名词land ，故用单数。

　　53.【答案】C。解析：该题考查数词加名词构成的合成词的用法。three-hour中间需加连字符左前置定语，journey可数需加不定冠词a。题意：用了很长时间才到那里。那是三个小时的旅程。

　　54.【答案】B。解析：该题考查数词的用法。hundreds和具体数连用不用复数;people当作人们皆不加复数。句意：200老人去年冬天死于寒冷。

　　55.【答案】C。解析:该题考查倍数表达法。倍数+as…as…句意：引进新技术后，这家工厂1988年生产的拖拉机是前一年的两倍。