A store owner was tacking a sign above his door that read “Puppies For Sale”. Signs like that have a way of attracting small children, and sure enough, a little boy appeared under the store owner’s sign. “How much are you going to sell the puppies for?” he asked. The store owner replied, “From $30 to $50.” The little boy reached in his pocket and pulled out some change. “I only have $2.37,” he said. “Can I look at them?”
The store owner smiled and whistled. Out of the kennel (狗窝) came a female dog, who ran out of his store, followed by five tiny balls of fur. One puppy was left behind, moving slowly. Immediately, the little boy found out the slowly limping (跛行的) puppy and said, “What’s wrong with that little dog?”
The store owner explained that the vet (兽医) had examined the little puppy and found that he didn’t have a hip socket (髋臼). He would always limp. The little boy became excited. “That is the little puppy that I want to buy.”
The store owner said, “No, you don’t need to buy that little dog. If you really want him, I will just give him to you.”
The little boy got quite upset. He looked straight into the store owner’s eyes, pointing his finger and said, “I don’t want you to give him to me. That little dog is worth every bit as much as all the other dogs and I will pay full price. I can give you $2.37 now, and then fifty cents a month until I have paid for him.”
The store owner countered, “You really don’t need to buy this little dog. He is never going to be able to run, jump and play with you like the other puppies.”
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The little boy stood his ground, determined to pay for the limping puppy.
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Overjoyed, the little boy handed over his $2.37 to the store owner.
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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

