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Amy: OK, Mum.
Mum: Amy!
Amy: OK, Mum. The light is red. Let's go.
Mum: Oh, no, Amy.
Amy: Oh, sorry, Mum. And when can I go?
Mum:
Amy: I know that now, Mum.
Mum: Don't walk on the grass.
Amy: Yes, Mum. I know.
| A．When the light is red, you can't go. |
| B．When the light is green. |
| C．It's dangerous. |
| D．And don't climb the tree. |
| E．Don't cross the road before you look at the lights. |
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
