摘要： An animal or a plant that is going extinct A. no longer exists in the world B. comes into this world soon C. becomes very dangerous D. has fewer and fewer living members B Once we climbed a very high mountain. It was so challenging for me because I was only ten years old. During the first few hours of climbing . I enjoyed the flowers and trees, and the birds’ singing, but as time passed, I got a pain in both of my legs. I wanted to quit climbing. In fact, I hated it at that mountain, but my father said to me, “You can always see a beautiful sky at the top of the mountain, but you can’t see it before you reach the top. Only there at the top, can you see all of the nice things, just like in life. At that time, I was too young to understand his words. But later after that, I got knew hope and confidence. I found myself standing at the top of the sky, which was as clear as crystal .

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