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Sarah: Mum.
Mum: It’s sunny and warm today.
Sarah: Wow, great! Let’s go shopping.
Mum: OK
Saleswoman (售货员):
Sarah: Yes, this dress is very pretty.
Saleswoman: Of course. Here you are
Mum:
Sarah: Yes, it’s just right.
Mum: Great!
Saleswoman: It’s 50 yuan.
Mum: It’s cheap. We will take it.
| A．Can I help you? |
| B．How much is it? |
| C．Is it OK? |
| D．What’s the weather like today? |
| E．Can I try it on? |
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
