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A: Hello.
B: Yes. This is Helen speaking.
A: This is Alice. What are you going to do this Sunday, Helen?
B: Nothing. What about you?
A: I want to buy a new mobile phone.
B: A mobile phone again?
A: I can use it to read e-books, take photos and go on the Internet.
B:
| A．That sounds great! |
| B．What can you use the new mobile phone to do? |
| C．May I speak to Helen? |
| D．Would you like to go with me? |
| E．Who’s that? |
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
