Three fourths of the surface of the earth__water.地球表面的3/4都是水。
                    举一反三
- Three fourths of the earth’s surface_______ water.地球表面四分之三是水。
 - 中国大学MOOC: 26. Three fourths of the surface of the earth ___ covered with water.
 - Approximately (three - fourths) of (the earth's) surface (are) covered (with) water. A: three-fourths B: the earth’s C: are D: with
 - -- Three fourths of the surface of the earth _________ sea. A: is B: are C: were D: has been
 - ________ of the earth ________ covered by sea. A: Three fourth; is B: Three fourths; is C: Three fourth; are D: Three fourths; are
 
