一道英语问题1.About three-fourths of the surface of the earth ? wa

three-fourths of the surface of the earth ( ) sea three-fourths of the surface of the earth ( ) sea 是is 还是are? three-fourths of the informationg about the 2008 Olympic Gam Oceans cover about three quarters of the earth's surface,改为一 Oceans cover about three-quarters of the earth's surface. 是什 Ocean cover about three-quarters of the earth's surface.（对't The surface of the Earth is about 70% water The surface arca of the earth is about( )square kilometers. Water _________ about seventy persent of the earth,s surface three fourths of the homework have finished Three-fourths of the buildings was destroyed. Three fourths of the homework ( )toda