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Lingling: Good morning. I'm Lingling. What's your name?
Amy: 1．
Lingling: How are you?
Amy: I'm fine, thank you. And you?
Lingling: 2． Thank you. Oh! 3．
Amy: It's a pen. And what's this?
Lingling: 4． Goodbye.
Amy: 5．
| A．What's this? |
| B．Goodbye! |
| C．I'm Amy. |
| D．I'm fine, too. |
| E．It's a cap. |
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
