完形填空。

阅读下面短文，掌握其大意，从每题所给的A、B、C、D四个选项中，选出最佳选项。

　　“You can always see a beautiful sky at the top of the mountain, but you can't see it before you reach the top.”

　　Whenever the sun 1 and the blue sky came up, my father and I used to climb the mountain near my house. 2 together, my father and I used to have a lot of conversations through which I learned 3 from his experiences.

　　This has largely influenced my life. 4 the mountain-climbing that we both enjoyed, we couldn't have had enough time to 5 together because my father was very busy. I believe mountaineering is really 6 . It gave me time to talk with my father and to be in deep thinking as well as 7 my patience. I love climbing mountains, to get away from the noise and pollution of the 8 , and breathe the fresh air.

　　One time we climbed a very high mountain. It was so 9 for me because I was only ten years old. After a few hours of climbing, I got a pain in my 10 .I wanted to 11 , but my father said to me, “You can 12 see a beautiful sky at the top of the mountain, but you can't see it 13 you reach the top. You can always enjoy the 14 of many waterfalls and countless peaks and valleys at the top of the mountain, 15 you can't when you are halfway up. Only there at the top, can you have all of those things, just like in 16 .”

　　At that time, I was too young to 17 his thoughts, but after that, I got new 18 and confidence. Finally, I found myself 19 at the top of the mountain. And there, I could see the whole of the sky, which was as 20 as crystal(水晶).

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