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It is Sunday morning. Mum is in Hong Kong. She’s calling Sam now.
Mum: Hi, Sam. This is mum. What are you doing now?
Sam: I’m drawing cartoons.
Mum:
Sam: OK. I will keep the floor clean, too.
Mum:
Sam: She’s playing ping-pong with Amy. Can I play ping-pong with them?
Mum: Sure.
Sam: He worked late last night. He’s sleeping now.
Mum: OK.
Sam: Yes. What are you doing, mum?
Mum: I’m walking on a bridge.
Sam:
Mum: No, Sam. Keep to the left. I’m in Hong Kong now.
| A．Keep your desk clean |
| B．Keep to the right |
| C．Talk quietly |
| D．Take turns |
| E．Good boy |
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
