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Feifei: Look!
Duoduo: Yes, their kite is very beautiful. Is there anything near the kite?
Feifei: Yes.
Duoduo: Amazing! The bird is so small. Can you see the little boy under the tree?
Feifei: Yes, I can.
Duoduo: Really? What's wrong with him?
Feifei: I don't know.
Duoduo: Good idea!
| A．He is crying now. |
| B．Those kids are flying a kite. |
| C．It's a bird! |
| D．Let's go and help him. |
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
