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Many years ago, there lived a doctor in a small town. He was very good and kind. People always went to him when they were ill. After many years, the doctor became old. He started to forget(忘记) things. People were afraid and didn’t ask him for help. The old doctor asked, “Why does no man come to me now?” No one wanted to tell him why, because they did not make the good man sad. They said, “Everyone is healthy in the town now. ”
1．The story was about(关于) a doctor.2．The doctor was good and kind.
3．People always went to him when they were ill.
4．After many years, the doctor became young.
5．Everyone is healthy in the town, so they didn’t ask him for help.
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
