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A: Hi, Lingling. 1．
B: Sorry, I don't know. Oh! Look! 2．
A: Sam, don't climb the wall. It's dangerous.
C: I'm sorry, Peter. 3．
A: Do you want to play a game?
C: 4．
A: Let's play hide-and-seek.
B&C: 5．
| A．But I'm feeling bored. |
| B．Of course. |
| C．Where is Sam? |
| D．Great! Let's go! |
| E．He's climbing the wall. |
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
