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A bird and a duck were going to see their friend, Mr Tiger. There was a wide river on the way.
The bird said to the duck, “We must fly across the river.”
“No, we must swim across the river,” the duck said to the bird.
They didn’t agree with each other. An old sheep came to them and said, “You are both right. Birds are good at flying. Ducks are good at swimming. Don’t be too proud. Don’t judge things only by your own experience（经验）.”
1．A bird and a fox were going to see their friend duck.2．On the way, the bird and the duck met a wide river.
3．The bird and the duck swam across the river.
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
