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Lily: This is Lily.
Jack: What are you doing?
Lily: 2．
Jack: 3．
Lily: She’s cooking dinner.
Jack: What is your father doing?
Lily: 4．
Jack: 5．
Lily: It’s eating fish.
Jack: Thank you.
Lily: You’re welcome. Bye.
| A．I’m watching TV. |
| B．What is your cat doing? |
| C．He’s reading a newspaper. |
| D．Can I speak to Lily? |
| E．What is your mother doing? |
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
