It is warm in spring. Mother Duck is making a nest(巢). She has three eggs. The eggs are in the nest. They are green and small. They are Mother Duck’s babies. Now there are four eggs in the nest. The fourth egg is big and white. Mother Duck sits on the nest.
The eggs open. Mother Duck is happy. She sees four ducklings (小鸭). Three ducklings are yellow and lovely. One duckling is big and grey. He is ugly. Mother Duck feeds her babies with small worms. The big grey duckling eats all of them.
Mother Duck swims in the pond. The yellow ducklings sit on her back. The ugly duckling is too heavy, so he swims behind them. The three ducklings often play together. They are happy. The ugly duckling is sad and lonely. He swims away. He does not want to stay with them.
It is so cold in winter. The ugly duckling goes into a house, but an old woman drives him away.
It is spring again. The ugly duckling is in the grass. Two big swans (天鹅) see him. “Hello, come and play.” “I’m an ugly duckling,” the duck says. “No! You’re a beautiful swan.” The ugly duckling looks into the pond. Now he is a swan. He is very happy.
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同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2