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One day, a dog has a piece of meat for his dinner. He goes home with the meat in his mouth. He is very happy. On his way home, there is a pond. He looked at it. What did he see? He sees a dog! And the dog has some meat in his mouth, too. ‘I want to get it, I can have two pieces of meat!’ He opens his mouth to get it. But his own meat falls into the pond. Oh, it is his shadow! He is sad.
1．One day a dog has two pieces of meat.2．There is a dog in the pond, too.
3．The dog’s meat falls into the pond.
4．The dog isn’t happy in the end.
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
