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Carl: Sure.
Kate:
Carl:
Kate: Yes, you are right. Then what should we do when we are at home?
Carl: We should keep our room clean.
Kate: Good. What must we do in the street?
Carl:
Kate: Sure. And we mustn’t pick the flowers in the park.
Carl: Yes.
| A．What should we do when we are in class? |
| B．And we must keep off the grass. |
| C．And we must obey the class rules. |
| D．And we shouldn’t watch TV too often. |
| E．We must wait for the green light. |
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
