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( )| A．I'm from China. | B．I'm from Canada. | C．I'm from America. |
( )| A．Goodbye, Mike! | B．Hello, I'm Mike. | C．Say “OK”! |
( )| A．This is a ball. | B．This is a balloon. | C．Bounce the ball. |
( )| A．This is a girl. | B．This is a boy. | C．This is a teacher. |
( )| A．Act like a cat. | B．Act like a duck. | C．Act like a dog. |
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
