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| |  |  |  |  |
| Amy’s(埃米的) present | × | × | √ | × |
| Sam’s present | × | × | × | √ |
| Daming’s present | × | √ | × | × |
| Lingling’s present | √ | × | × | × |
1．—How many presents? ( )
—________
| A．Two. | B．Three. | C．Four. |
—________
| A．Two. | B．Three. | C．Four. |
| A．cake | B．pen | C．cat |
| A．cake | B．pen | C．cat |
| A．cake | B．cat | C．cap |
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
