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Dad, Mum: Merry Christmas, Children!
Peter:
Mum: Go to the living room and find them.
Ann:
Peter: Oh, so many presents on it.
Ann:
Dad: It’s a toy dog. It’s for you, Ann.
Peter:
Dad: They’re picture books. They are for you, Peter.
Ann, Peter: Thank you, Dad and Mum.
| A．What are these? |
| B．What’s this? |
| C．What a pretty Christmas tree! |
| D．Merry Christmas, Mum. |
| E．Where are our presents? |
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
