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Mary: Hi, Sam. How many crayons do you have?
Sam: I have twenty crayons.
Mary: Are you sure?
Sam: Of course.
Mary: But there are only nineteen crayons.
Sam: Oh, did I lose one?
Mary: No, you didn’t. There is one on the floor.
Sam: Yeah, I’m so happy.
Mary: Now there are twenty crayons.
1．Sam didn’t lose one crayons.
2．Sam has nineteen crayons.
3．Mary found the crayon on the floor.
4．Sam felt happy that the crayon was found.
5．Sam has twenty crayons at last.
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
