._____ receives only a small portion of the total amount of the sun’s energy.

问题描述:

._____ receives only a small portion of the total amount of the sun’s energy.
  A.The earth’s surface        B.The surface of earth
  C.The surface earth         D.The earth surface
求讲解.拜托高人!

答案是A
考的是名词所有格,The earth’s surface 相当于The surface of the earth.