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1．Why are the two speakers upset?
| A．It may snow during their vacation. |
| B．They may not be able to take their vacation. |
| C．They may fail to join the graduation ceremony. |
| A．They are going skiing. |
| B．They have made bookings for their plane. |
| C．Their flight has been cancelled. |
| A．The earthquake. |
| B．The bad winter. |
| C．A terrible flu. |
| A．Talk to Professor Hampton. |
| B．Speak to all of the other people. |
| C．Call the travel agency. |
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
