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Mum: Oh! It's very exciting. What is ChenJie doing?
Zhang Peng: 1．
Mum: Is John playing chess(下棋)?
Zhang Peng: 2．
Mum: 3．
Zhang Peng: I'm reading a storybook.
Mum: What are the girls doing?
Zhang Peng: 4．
Mum: Are you having a good time?
Zhang Peng: 5．
Mum: How wonderful!
| A．They are singing. |
| B．Yes, he is. |
| C．Yes, we are. |
| D．What are you doing? |
| E．He is flying a kite. |
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
