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1．当你在课堂上回答老师的问题，回答正确的时候，老师会说：
| A．You’re right. |
| B．You’re wrong. |
| C．Sit down , please. |
| A．You should write these words. |
| B．Can you write these words? |
| C．Are you writing these words? |
| A．What are they doing? |
| B．What is this boy doing? |
| C．What is she doing? |
| A．We’re watching to games. |
| B．I am playing football. |
| C．You are playing basketball. |
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
