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( )| A．This is a plane. |
| B．This is a bus. |
| C．This is a car. |
( )| A．They are crying. |
| B．She is happy. |
| C．She is sad. |
( )| A．I am busy. |
| B．They are busy |
| C．She is not busy. |
( )| A．It’s fifty-five yuan. |
| B．It’s fifty-six yuan. |
| C．It’s fifty-seven yuan. |
( )| A．This is a plane. |
| B．This is a boat. |
| C．This is a ship. |
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
