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Mum: Eat your broccoli (西兰花).
Fred: I don’t like broccoli.
Mum: What a pity! If you eat your broccoli,you can have an ice cream.
Fred: I don’t like broccoli.
Mum: If you eat your broccoli, you can have an ice cream and you can watch TV for an hour.
Fred: I don’t like broccoli!
Mum: If you eat your broccoli, you can have an ice cream, watch TV for an hour and go to bed late.
Fred: Mum, why don’t you eat your carrots?
Mum: I don’t like carrots.
Fred: What a pity! If you eat your carrots, I'll do the dishes.
Mum: I don’t like carrots.
Fred: If you eat your carrots. I’ll do the dishes and wash the clothes.
Mum: I don’t like carrots.
Dad: If you eat your own broccoli and carrots, I will make a big bowl of ice cream for both of you. How about that?
(Fred, Mum and Dad: We all love ice cream!)
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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
