判断推理 Nearly (three quarters of the surface) of the earth (are) covered with water, and (there) would be even less land (if) the polar icecaps were melt.
【正确答案】 B
【答案解析】主谓一致。应改为is。主语是不可数名词，用分数修饰后并未改变它的性质。[译文]近3／4的地球表面被水覆盖，如果极地的冰盖融化了，陆地的面积将进一步缩小。