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| A．What’s that? | B．Is that a kite? |
| C．Hi, Aggie! | D．It’s my umbrella. |
Toby: (1) ________
Aggie: What’s this?
Toby: (2) ________
Aggie: Wow, how beautiful!
Toby: Look! (3) ________
Aggie: No, it isn’t. It’s a bird.
Toby: (4) ________
Aggie: It’s a dog.
Toby: Oh, it’s so cute.
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
