A. B. C.
D. E. F.
1.—Goodbye, Su Hai. —Goodbye, Mike. (_____)
2.—Good morning, Sam. —Good morning. (_____)
3.—Are you Yang Ling? —Yes, I am. (_____)
—Hi, Yang Ling. I’m Mike. —Hello, Mike.
4.—Hello. Are you Liu Tao? —Yes, you’re right. (_____)
5.—Are you Helen? —Oh, no. I’m Su Hai. (_____)
6.—Goodbye, Miss Li. —Goodbye, 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