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David: Hello. This is David, Is that Sarah?
Sarah:
David: What are you doing, Sarah?
Sarah: I’m drawing a picture.
David: I’m cleaning our classroom.
Sarah: You are helpful.
David: There is a birthday card on your chair.
Sarah: Oh, yes. It’s mine. Tomorrow is my mother’s birthday.
David: What will you do for your mother tomorrow?
Sarah: Father buys her a cake. I’ll cook noodles for her.
David:
Sarah: Thank you!
| A．Have a good time! |
| B．It’s for her. |
| C．Yes, this is Sarah. |
| D．Is it yours? |
| E．What about you? |
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
