About ________ of the surface of the earth is covered by water.A. two-thirdB. three quarterC. seventy percentD. one half答案 D 为什么不行?a half与one half 有何区别?谢谢!
老师好:请教一下。 下面的例子出于《柯林斯高阶英汉双解词典》 例 I was gradually being brought face to face with the fact that I had very little success. 问题:这里face to face 是起什么作用?如果没有这个...
The difference of thermal insulation capability among the Structure I and II. 在thermal insulation capability前要不要加冠词呢,为什么?The term represents soil heat flow of the modified SC by heat conduction. 在soil heat flow和he at conduction前要不要加冠词,为什么?