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Amy: I want to buy a notebook.
Mary: This way, please. There are red, blue and green notebooks. What colour do you like?
Amy: I like green. I want to buy some green notebooks.
Mary: The green notebooks are over there.
Amy: Oh! They are beautiful! I want to buy two green notebooks.
Mary: Here you are.
Amy: How much are they?
Mary: 6 yuan.
1．Mary and Amy want to buy some notebooks.
2．There are red, blue and green notebooks in the shop.
3．Amy likes green.
4．Mary wants red and blue notebooks.
5．One green notebook is 3 yuan.
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
