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(In the shop)
A: What can I do for you?
B: I would like to buy a T-shirt for my mum.
A: 1．?
B: She likes purple.
A: All right. 2． does she take?
B: Small.
A: 3．?
B: It’s great. May I try it on?
A: Certainly.
B:4．?
A: It’s 198 yuan.
B: That’s too much.
A: But wait a minute! There is a sale on today. Everything is half price.
B: OK! 5．.
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
