Read the text and choose the correct answer.III. After months of colder weather, the days get longer, the buds come out in the trees, birds sing, and the world puts on a green dress. Spring passes into summer. Everyone knows that summer will not last. The power of all the wisest men and women in the world cannot keep it for us. The corn becomes ripe, the leaves turn brown and then drop to the ground, and the world changes its green dress for a dress of autumn colors.B. This story is mainly about -