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（ ）1 Are you Mike? A Good morning.
（ ）2 Hello. I’m Su Hai. B Hello, Yang Ling.
（ ）3 Hi, Sam. C No, I’m not.
（ ）4 Good afternoon, Miss Li. D Good morning , Tim.
（ ）5 This is my brother, Tim. E Hi, Bobby.
（ ）6 She is my sister, Yang Ling. F Yes, I am Su Hai.
（ ）7 Are you Su Hai? G Hello, Su Hai.
（ ）8 Good morning, Helen. H Good afternoon, class.
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
