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Jack: Wait a minute, Mum.
Mum: Hurry up! You can make it later.
Jack: OK. What must I do first?
Mum:
jack: All right.
Mum: That’s right.
Jack: I see.
| A．You should keep your bed clean. |
| B．But it’s so messy now. |
| C．What makes your bed messy? |
| D．Then, I’ll fold up the quilt(叠被子). |
| E．Put all your clothes in the wardrobe. |
| F．I’m making a paper plane. |
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
