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Emma: I’m making a birthday card in my room.
mum:
Emma: He is doing his homework
Mum: Is your dad free now?
Emma: No.
Mum: I'm making a birthday cake for your grandpa. But there are no eggs.
Emma: I can help you.
Mum: OK.
Emma: No problem.
| A．Please buy some eggs at the supermarket. |
| B．What is your brother doing? |
| C．Who can help me? |
| D．Where are you, Emma? |
| E．He's talking to Grandpa on the phone. |
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
