20 12 Sichuan college entrance examination composition topic

20 12 Sichuan college entrance examination Chinese composition topic: read the following poem: holding a drop of water in your hand, there is a sunny genealogy, a past tense and future tense of snow, a continental shelf and a desert, and a person's life. Holding a drop of water in my hand means holding a world, but a small accident, such as a slip, is enough to make me lose it all. According to the poem "Holding a Drop of Water", write a composition of not less than 800 words on the topic of "water".