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1．Why are you so worried?
（ ）| A．Because my new watch is missing. | B．Because my mum is ill. |
（ ）| A．Why does he look so surprised? | B．Why does he look so happy? |
（ ）| A．Speaking. | B．This is Maomao. |
（ ）| A．Because her dog is missing. | B．Because the room is messy. |
（ ）| A．Sorry, she is not at home. | B．I’m Guoguo. |
（ ）| A．I take the red one. | B．Yes, of course. |
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
