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When Mary Smith was a____, she wanted to be a teacher,____she liked children. When she was twenty, she began teaching in a small school. She was a good teacher, and she____a lot with the children in her class. They____her teaching.
One day,____of the girls in her class said to her, “Miss Smith,____does a man’s hair become grey before his beard (胡子)does?”
Mary laughed(笑) and answered, “I don’t know. Helen, do you know?”
“I don’t know,____. Miss Smith,” said Helen, “But it happened____my father.” The other children in the class laughed when they heard this.
Then a boy said, “I____, Miss Smith! A man’s hair becomes grey____because it’s sixteen years older than his beard.”
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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
