阅读理解。

it was not easy for me to come here. do you know where i come from?

几天前，我正舒舒服服地飘浮在重庆天空中的一片云彩里欣赏美景呢。

i stayed there for a few days and then i took a long journey to flow into the huangpu river.

我一开始就是从那里来的，记住不要浪费我。

如果没有水，地球上的生命就会消失。