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Sarah:
Lily: They are swinging.
Sarah: That is the mother monkey.
Lily:
Sarah: It's climbing the hill. How quickly!
Lily: Yes, and I can see an elephant. Can you see it?
Sarah:
Lily: What is it doing?
Sarah:
Lily: Look! There is a beautiful lake. Many ducks are on it. What are they doing?
Sarah:
| A．It's playing with water. |
| B．What are they doing? |
| C．I like them. |
| D．What is it doing? |
| E．Yes, it's under the tree. |
| F．They are swimming. |
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
