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One afternoon just before Christmas, an old man sees a little boy in the street. The boy sits on the ground and cries sadly. “Why are you crying?” asks the man. “I lost a ten-penny piece(十便士硬币),” says the boy. The old man gives a new ten-penny piece to him. “Thank you very much,” says the little boy.
About an hour later, the old man walks backs home on the same streets. He sees the little boy sitting in the same place and still cries sadly. He goes up to the boy and asks, “Did you lose the ten-penny piece again?” “No,” says the boy. “If I could find my piece, I would have twenty pennies now.”
1．The story happens on Christmas Day.2．The boy can’t find his ten-penny piece, so he cries.
3．The boy lost the ten-penny piece two times that day.
4．The boy is waiting for the old man.
5．The boy has twenty pennies now.
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
