probably you have seen photos…完形填空

通读下面的短文，掌握其大意，然后从各小题所给的四个选项中，选出一个最佳答案。
Probably you have seen photos of the Grand Canyon. But you must go there 16 to feel its size and beauty. The Grand Canyon is one of the greatest
17 wonders of the world.
The Colorado River made the Grand Canyon over millions of years. Slowly, the river cut down 18 hard rocks. At the same time, the land was 19 . Today the canyon is very 20 . It’s also very 21 , about 20 kilo-
metres. And 22 its height, there are different kinds of plants and animals on both sides of the canyon.
The canyon looks different at different times of the day, and 23 different seasons and weather. At sunrise, the red, gold, brown and orange colours of the rocks are 24 clear and bright. Whether you see the Grand Canyon from the top or the bottom, it will be a(n) 25 that you will never forget.
( )16. A. you B. your C. yours D. yourself